What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-22 · updated 2026-10-22
• Weakness: CWE-79

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

• OpenCATS: from 0.10.0 before 0.12.0 — fixed in 0.12.0

How to fix

Upgrade to a fixed version: OpenCATS 0.12.0. Check the vendor advisory for mitigations.

References

• https://github.com/opencats/OpenCATS/commit/f82e0ee3045845b90b7e111c46f30998496e38a8
• https://github.com/opencats/OpenCATS/commits/master/lib/MRU.php
• https://github.com/opencats/OpenCATS/releases/tag/v0.12.0
• https://www.vulncheck.com/advisories/opencats-before-stored-xss-via-mru-navigation-panel

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