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

Status: published. Published: 2026-10-22. Updated: 2026-11-04.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/opencats/OpenCATS/commit/f82e0ee3045845b90b7e111c46f30998496e38a8
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/opencats/OpenCATS/releases/tag/v0.12.0

## Affected products and versions

- opencats / OpenCATS (opencats/OpenCATS): ≥ 0.10.0; < 0.12.0 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.7 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.30% as of 2026-11-04; percentile 22.41%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/opencats/OpenCATS/commit/f82e0ee3045845b90b7e111c46f30998496e38a8 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/opencats/OpenCATS/commits/master/lib/MRU.php (CNA: VulnCheck; issue-tracking)

- https://github.com/opencats/OpenCATS/releases/tag/v0.12.0 (CNA: VulnCheck; patch, release-notes)

- https://www.vulncheck.com/advisories/opencats-before-stored-xss-via-mru-navigation-panel (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-115513; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-115513; retrieved 2026-11-04; source updated Not reported

Revision: 6d937ce90c0b42f09500b131ee3298303d856e964436a94d827ece8398a6623e

Canonical: https://y2.dev/cve/CVE-2026-115513

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