UBUNTU-CVE-2026-49283

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Source
https://ubuntu.com/security/CVE-2026-49283
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-49283
Upstream
Published
2026-08-19T15:17:00Z
Modified
2026-09-15T20:16:39Z
Severity
  • 8.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1, the HTTPArtifact::receive() flow can treat an unsigned embedded SAML Response as cryptographically valid for the wrong identity provider. SOAPClient::addSSLValidator() attaches a TLS-based validator to the outer SOAP ArtifactResponse, while the embedded Response receives a validator that delegates to the outer message and is later checked against metadata selected from the embedded response issuer rather than necessarily the artifact issuer. SOAPClient::validateSSL() returns normally when the TLS public key does not match the key being validated, and SAML2\Message::validate() treats a validator call that does not throw as successful. In a multi-IdP federation, a malicious or lower-trust IdP can therefore provide an ArtifactResponse containing an unsigned Response that claims a higher-trust victim IdP as issuer and authenticate as arbitrary users with attacker-chosen assertion attributes, NameID, and session data. This issue is fixed in versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1.

References

Affected packages

Ubuntu:24.04:LTS
simplesamlphp

Package

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

Affected ranges

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

Affected versions

1.*
1.19.7-1
1.19.7-1+deb12u1ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "simplesamlphp",
            "binary_version": "1.19.7-1+deb12u1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
Ubuntu:26.04:LTS
simplesamlphp

Package

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

Affected ranges

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

Affected versions

1.*
1.19.7-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "simplesamlphp",
            "binary_version": "1.19.7-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
Ubuntu:Pro:16.04:LTS
simplesamlphp

Package

Name
simplesamlphp
Purl
pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps-legacy%2Fxenial

Affected ranges

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

Affected versions

1.*
1.13.2-1
1.14.0-1
1.14.0-1ubuntu2
1.14.0-1ubuntu2+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "simplesamlphp",
            "binary_version": "1.14.0-1ubuntu2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
Ubuntu:Pro:18.04:LTS
simplesamlphp

Package

Name
simplesamlphp
Purl
pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

1.*
1.14.15-1
1.15.0-1
1.15.1-1
1.15.2-1
1.15.3-1
1.15.3-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "simplesamlphp",
            "binary_version": "1.15.3-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
Ubuntu:Pro:20.04:LTS
simplesamlphp

Package

Name
simplesamlphp
Purl
pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Ffocal

Affected ranges

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

Affected versions

1.*
1.17.5-1
1.17.6-1
1.17.6-2
1.18.1-1
1.18.4-1
1.18.4-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "simplesamlphp",
            "binary_version": "1.18.4-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"
Ubuntu:Pro:22.04:LTS
simplesamlphp

Package

Name
simplesamlphp
Purl
pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

1.*
1.19.1-1
1.19.1-1.1
1.19.1-1.1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "simplesamlphp",
            "binary_version": "1.19.1-1.1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49283.json"