SquirrelMail - XSS (CVE-2002-1131)

CVE-2002-1131 is a vulnerability in SquirrelMail that permits cross-site scripting attacks via multiple web interface endpoints, potentially enabling threat actors to execute malicious scripts in the context of other users.

CrowdSec has been tracking this vulnerability and its exploits since 2nd of April 2025.

Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2002-1131 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2002-1131. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.

Observed exploitation techniques involve requests to endpoints such as /src/addressbook.php, /src/options.php, /src/search.php, and /src/help.php.