UBUNTU-CVE-2026-73208

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Source
https://ubuntu.com/security/CVE-2026-73208
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73208.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-73208
Upstream
  • CVE-2026-73208
Published
2026-08-28T00:00:00Z
Modified
2026-09-02T19:36:41Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the audience claim is used in its place and checked against the configured required scopes. These are different concepts, and the audience claim does not describe what a token is allowed to do. A token that grants no relevant permissions can be accepted because its intended recipient value happens to match a configured scope name, granting access that should have been denied. It also hides an identity provider misconfiguration where scopes are not being issued at all. Ensure the identity provider issues a scope claim for all tokens used with Dovecot, and that configured scope names do not match audience values. Update to non-vulnerable version. No publicly available exploits are known.

References

Affected packages

Ubuntu:16.04:LTS
dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:2.*
1:2.2.18-2ubuntu2
1:2.2.22-1ubuntu1
1:2.2.22-1ubuntu2
1:2.2.22-1ubuntu2.1
1:2.2.22-1ubuntu2.2
1:2.2.22-1ubuntu2.3
1:2.2.22-1ubuntu2.4
1:2.2.22-1ubuntu2.6
1:2.2.22-1ubuntu2.7
1:2.2.22-1ubuntu2.8
1:2.2.22-1ubuntu2.9
1:2.2.22-1ubuntu2.10
1:2.2.22-1ubuntu2.11
1:2.2.22-1ubuntu2.12
1:2.2.22-1ubuntu2.13
1:2.2.22-1ubuntu2.14

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "dovecot-core",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-gssapi",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-imapd",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-ldap",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-lmtpd",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-lucene",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-managesieved",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-mysql",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-pgsql",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-pop3d",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-sieve",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-solr",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "dovecot-sqlite",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        },
        {
            "binary_name":  "mail-stack-delivery",
            "binary_version":  "1:2.2.22-1ubuntu2.14"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73208.json"
Ubuntu:18.04:LTS
dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:2.*
1:2.2.27-3ubuntu1
1:2.2.33.2-1ubuntu1
1:2.2.33.2-1ubuntu2
1:2.2.33.2-1ubuntu3
1:2.2.33.2-1ubuntu4
1:2.2.33.2-1ubuntu4.1
1:2.2.33.2-1ubuntu4.2
1:2.2.33.2-1ubuntu4.3
1:2.2.33.2-1ubuntu4.4
1:2.2.33.2-1ubuntu4.5
1:2.2.33.2-1ubuntu4.6
1:2.2.33.2-1ubuntu4.7
1:2.2.33.2-1ubuntu4.8

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "dovecot-core",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-gssapi",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-imapd",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-ldap",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-lmtpd",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-managesieved",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-mysql",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-pgsql",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-pop3d",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-sieve",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-solr",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "dovecot-sqlite",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        },
        {
            "binary_name":  "mail-stack-delivery",
            "binary_version":  "1:2.2.33.2-1ubuntu4.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73208.json"
Ubuntu:20.04:LTS
dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:2.*
1:2.3.4.1-5ubuntu3
1:2.3.7.2-1ubuntu1
1:2.3.7.2-1ubuntu2
1:2.3.7.2-1ubuntu3
1:2.3.7.2-1ubuntu3.1
1:2.3.7.2-1ubuntu3.2
1:2.3.7.2-1ubuntu3.3
1:2.3.7.2-1ubuntu3.4
1:2.3.7.2-1ubuntu3.5
1:2.3.7.2-1ubuntu3.6
1:2.3.7.2-1ubuntu3.7

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "dovecot-auth-lua",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-core",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-gssapi",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-imapd",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-ldap",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-lmtpd",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-lucene",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-managesieved",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-mysql",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-pgsql",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-pop3d",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-sieve",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-solr",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-sqlite",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "dovecot-submissiond",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        },
        {
            "binary_name":  "mail-stack-delivery",
            "binary_version":  "1:2.3.7.2-1ubuntu3.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73208.json"
Ubuntu:22.04:LTS
dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:2.*
1:2.3.13+dfsg1-1ubuntu3
1:2.3.16+dfsg1-3ubuntu1
1:2.3.16+dfsg1-3ubuntu2
1:2.3.16+dfsg1-3ubuntu2.1
1:2.3.16+dfsg1-3ubuntu2.2
1:2.3.16+dfsg1-3ubuntu2.4
1:2.3.16+dfsg1-3ubuntu2.6
1:2.3.16+dfsg1-3ubuntu2.7
1:2.3.16+dfsg1-3ubuntu2.8
1:2.3.16+dfsg1-3ubuntu2.9

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "dovecot-auth-lua",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-core",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-gssapi",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-imapd",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-ldap",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-lmtpd",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-lucene",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-managesieved",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-mysql",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-pgsql",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-pop3d",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-sieve",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-solr",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-sqlite",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        },
        {
            "binary_name":  "dovecot-submissiond",
            "binary_version":  "1:2.3.16+dfsg1-3ubuntu2.9"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73208.json"
Ubuntu:24.04:LTS
dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:2.*
1:2.3.20+dfsg1-1ubuntu3
1:2.3.21+dfsg1-2ubuntu1
1:2.3.21+dfsg1-2ubuntu2
1:2.3.21+dfsg1-2ubuntu4
1:2.3.21+dfsg1-2ubuntu5
1:2.3.21+dfsg1-2ubuntu6
1:2.3.21+dfsg1-2ubuntu6.1
1:2.3.21+dfsg1-2ubuntu6.2
1:2.3.21+dfsg1-2ubuntu6.3
1:2.3.21+dfsg1-2ubuntu6.4
1:2.3.21+dfsg1-2ubuntu6.5

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "dovecot-auth-lua",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-core",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-gssapi",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-imapd",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-ldap",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-lmtpd",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-managesieved",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-mysql",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-pgsql",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-pop3d",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-sieve",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-solr",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-sqlite",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        },
        {
            "binary_name":  "dovecot-submissiond",
            "binary_version":  "1:2.3.21+dfsg1-2ubuntu6.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73208.json"
Ubuntu:26.04:LTS
dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:2.*
1:2.4.1+dfsg1-5ubuntu4
1:2.4.1+dfsg1-5ubuntu5
1:2.4.2+dfsg1-3ubuntu1
1:2.4.2+dfsg1-3ubuntu2
1:2.4.2+dfsg1-3ubuntu2.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "dovecot-auth-lua",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-core",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-flatcurve",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-gssapi",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-imapd",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-ldap",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-lmtpd",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-managesieved",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-mysql",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-pgsql",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-pop3d",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-sieve",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-solr",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-sqlite",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        },
        {
            "binary_name":  "dovecot-submissiond",
            "binary_version":  "1:2.4.2+dfsg1-3ubuntu2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73208.json"
Ubuntu:Pro:14.04:LTS
dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:2.*
1:2.1.7-7ubuntu3
1:2.2.9-1ubuntu1
1:2.2.9-1ubuntu2
1:2.2.9-1ubuntu2.1
1:2.2.9-1ubuntu2.3
1:2.2.9-1ubuntu2.4
1:2.2.9-1ubuntu2.5
1:2.2.9-1ubuntu2.6
1:2.2.9-1ubuntu2.6+esm1
1:2.2.9-1ubuntu2.6+esm2
1:2.2.9-1ubuntu2.6+esm3
1:2.2.9-1ubuntu2.6+esm4

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "dovecot-core",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-gssapi",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-imapd",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-ldap",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-lmtpd",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-managesieved",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-mysql",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-pgsql",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-pop3d",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-sieve",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-solr",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "dovecot-sqlite",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        },
        {
            "binary_name":  "mail-stack-delivery",
            "binary_version":  "1:2.2.9-1ubuntu2.6+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73208.json"