UnratedRed Hat & Ubuntu Linux
Postorius vulnerability
USN-8323-1 Published May 27, 2026
CVE-2026-44742
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
It was discovered that Postorius did not properly escape HTML in message subjects when rendering the Held messages pop-up. An attacker could possibly use this issue to inject arbitrary HTML, resulting in exposure of sensitive information. Affected Ubuntu releases: 26.04, 25.10, 24.04, 22.04, 20.04, 18.04. CVEs: CVE-2026-44742.
Affected versions
- Ubuntu 26.04
- Ubuntu 25.10
- Ubuntu 24.04
- Ubuntu 22.04
- Ubuntu 20.04
- Ubuntu 18.04
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Apply available updates: `sudo apt update && sudo apt upgrade` (a standard system update installs the fix).
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
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