[ CVE-2026-91831 · Published 19 Oct 2026 ]
Vulnerability in Unknown Subscribe to Comments
CVSS 3.8
EPSS <1%No fix listed yet
[ Description ]Official description
The Subscribe to Comments WordPress plugin before 2.3.3 does not sanitise newline characters from a notification sender-name setting before using it in e-mail headers, allowing users with Author-level access and above to inject arbitrary e-mail headers, such as a hidden Bcc, and to spoof the sender.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.