UBUNTU-CVE-2026-44742

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Source
https://ubuntu.com/security/CVE-2026-44742
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-44742
Upstream
  • CVE-2026-44742
Downstream
Related
Published
2026-05-07T19:16:00Z
Modified
2026-05-27T18:00:06.489360765Z
Severity
  • 7.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Postorius through 1.3.13 does not escape HTML in the message subject when rendering it in the Held messages pop-up, as exploited in the wild in May 2026.

References

Affected packages

Ubuntu:25.10
postorius

Package

Name
postorius
Purl
pkg:deb/ubuntu/postorius?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.3.13-1ubuntu1.1~25.10.1

Affected versions

1.*
1.3.13-1
1.3.13-1ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.3.13-1ubuntu1.1~25.10.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"
Ubuntu:26.04:LTS
postorius

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.3.13-1ubuntu1.1~26.04.1

Affected versions

1.*
1.3.13-1ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.3.13-1ubuntu1.1~26.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"
Ubuntu:Pro:18.04:LTS
postorius

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.1.2-3ubuntu0.1+esm1

Affected versions

1.*
1.1.0-1
1.1.1-1
1.1.2-1
1.1.2-2
1.1.2-3
1.1.2-3ubuntu0.1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "python-django-postorius",
            "binary_version": "1.1.2-3ubuntu0.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"
Ubuntu:Pro:20.04:LTS
postorius

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.2.4-1ubuntu0.1+esm1

Affected versions

1.*
1.2.4-1
1.2.4-1ubuntu0.1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.2.4-1ubuntu0.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"
Ubuntu:Pro:22.04:LTS
postorius

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.3.5-1ubuntu0.1~esm1

Affected versions

1.*
1.3.4-2
1.3.5-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.3.5-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"
Ubuntu:Pro:24.04:LTS
postorius

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.3.10-1ubuntu0.1~esm1

Affected versions

1.*
1.3.8-3
1.3.10-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.3.10-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"