Vulnerability · Published Oct 22, 2026 · Assigned by VulnCheck

CVE-2026-115513OpenCATS before 0.12.0 Stored XSS via MRU Navigation Panel

High 8.7

In plain English

A high-severity cross-site scripting in OpenCATS from opencats. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)8.7High

Exploit odds (30 days)0.3%top 77.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

OpenCATS before 0.12.0 contains a stored cross-site scripting vulnerability that allows a low-privileged authenticated user to inject HTML/JavaScript payloads by setting a Candidate, Company, Contact, Job Order, or List name/title field, which is stored unsanitized and later rendered unescaped in the 'Recent' (MRU) navigation panel displayed on nearly every page via lib/MRU.php's getFormatted() function. Attackers can exploit this by crafting a malicious record name that executes arbitrary JavaScript in the session of any other user, including Site Administrators, who views the record, enabling session/cookie theft and privilege escalation to full administrative control.

Affected products (as reported)

Vendor	Product	Versions
opencats	OpenCATS	0.10.0 – before 0.12.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

References

https://github.com/opencats/OpenCATS/commit/f82e0ee3045845b90b7e111c46f30998496e38a8 issue-tracking, patch
https://github.com/opencats/OpenCATS/commits/master/lib/MRU.php issue-tracking
OpenCATS v0.12.0 Release Notes patch, release-notes
VulnCheck Advisory: OpenCATS before 0.12.0 Stored XSS via MRU Navigation Panel third-party-advisory