Medium severity · published May 7, 2026
CVE-2026-44742
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
6.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PO
Postorius · Postorius project
through 1.3.13 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44742
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44742
Patch
https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b
Issue Tracking
https://gitlab.com/mailman/postorius/-/issues/620
Issue Tracking
https://gitlab.com/mailman/postorius/-/merge_requests/972
Mailing List
https://www.openwall.com/lists/oss-security/2026/05/07/3
lists.debian.org
https://lists.debian.org/debian-lts-announce/2026/05/msg00045.html
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CVE-2021-40347
An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5