PT-2026-38553 · Postorius · Postorius

Published 2026-05-07 · Updated 2026-05-07 · CVE-2026-44742

Mitre

CVSS v3.1

7.2

High

Base vector

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

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-44742

Affected Products

Postorius

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-44742 · Security Note
• https://openwall.com/lists/oss-security/2026/05/07/3 · Note
• https://gitlab.com/mailman/postorius/-/issues/620 · Note
• https://gitlab.com/mailman/postorius/-/merge_requests/972 · Note
• https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b · Note