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.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2002-1131 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. In addition, according to the CrowdSec network, attack volume against CVE-2002-1131 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.

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