{"id":"UBUNTU-CVE-2026-44742","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.","modified":"2026-05-27T18:00:06.489360765Z","published":"2026-05-07T19:16:00Z","related":["USN-8323-1"],"upstream":["CVE-2026-44742"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-44742"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-44742"},{"type":"REPORT","url":"https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b"},{"type":"REPORT","url":"https://gitlab.com/mailman/postorius/-/merge_requests/972"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8323-1"}],"affected":[{"package":{"name":"postorius","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/postorius?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.2-3ubuntu0.1+esm1"}]}],"versions":["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_version":"1.1.2-3ubuntu0.1+esm1","binary_name":"python-django-postorius"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"}},{"package":{"name":"postorius","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/postorius?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.4-1ubuntu0.1+esm1"}]}],"versions":["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"}},{"package":{"name":"postorius","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/postorius?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.5-1ubuntu0.1~esm1"}]}],"versions":["1.3.4-2","1.3.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-django-postorius","binary_version":"1.3.5-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"}},{"package":{"name":"postorius","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/postorius?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.10-1ubuntu0.1~esm1"}]}],"versions":["1.3.8-3","1.3.10-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-django-postorius","binary_version":"1.3.10-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"}},{"package":{"name":"postorius","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/postorius?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.13-1ubuntu1.1~25.10.1"}]}],"versions":["1.3.13-1","1.3.13-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-django-postorius","binary_version":"1.3.13-1ubuntu1.1~25.10.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"}},{"package":{"name":"postorius","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/postorius?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.13-1ubuntu1.1~26.04.1"}]}],"versions":["1.3.13-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-django-postorius","binary_version":"1.3.13-1ubuntu1.1~26.04.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44742.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}