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Description

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.

PUBLISHED Reserved 2026-05-07 | Published 2026-05-07 | Updated 2026-05-08 | Assigner mitre




HIGH: 7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Product status

Default status
unknown

Any version
affected

References

gitlab.com/...ommit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b

gitlab.com/mailman/postorius/-/merge_requests/972

gitlab.com/mailman/postorius/-/issues/620

www.openwall.com/lists/oss-security/2026/05/07/3

cve.org (CVE-2026-44742)

nvd.nist.gov (CVE-2026-44742)

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