PT-2026-38553 · Postorius+2 · Postorius+2

Alyssa Ross · Published 2026-05-07 · Updated 2026-05-27 · CVE-2026-44742

Positive Technologies (AI Summary)

CVSS v3.1

7.2

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Postorius versions prior to 1.3.14

Description The software fails to escape HTML in the message subject when rendering it within the Held messages pop-up. This issue was exploited in the wild in May 2026.

Recommendations Update to a version newer than 1.3.13.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-44742

GHSA-R7C9-7PJQ-HMM8

USN-8323-1

Affected Products

Linuxmint

Postorius

Ubuntu

References · 21

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44742.json · Exploit
• https://osv.dev/vulnerability/USN-8323-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-44742 · Security Note
• https://gitlab.com/mailman/postorius/-/merge_requests/972 · Patch
• https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b · Patch
• https://openwall.com/lists/oss-security/2026/05/07/3 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-44742 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-44742 · Vendor Advisory
• https://gitlab.com/mailman/postorius/-/issues/620 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-44742 · Security Note
• https://ubuntu.com/security/CVE-2026-44742 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8323-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-44742 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-r7c9-7pjq-hmm8 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-44742 · Vendor Advisory