XSS in Opencats
CVE-2026-115513
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/opencats/OpenCATS/commit/f82e0ee3045845b90b7e111c46f30998496e38a8 (issue-tracking)
- github.com/opencats/OpenCATS/commits/master/lib/MRU.php (issue-tracking)
- github.com/opencats/OpenCATS/releases/tag/v0.12.0 (patch)
- www.vulncheck.com/advisories/opencats-before-stored-xss-via-mru-navigation-panel (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115513?
- CVE-2026-115513 is a high-severity vulnerability in Opencats, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-10-22.
- How severe is CVE-2026-115513?
- High severity. CVSS v3 base score is 8.7 out of 10.