XSS in Grabaperch Perch
CVE-2025-66686
A stored Cross-Site Scripting (XSS) vulnerability exists in Perch CMS version 3.2. An authenticated attacker with administrative privileges can inject malicious JavaScript code into the “Help button url” setting within the admin panel. The injected payload is stored and executed when any authenticated user clicks the Help button, potentially leading to session hijacking, information disclosure, privilege escalation, and unauthorized administrative actions.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (11.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Grabaperch Perch — versions 3.2
Weakness classification (CWE)
References
- github.com/mertdurum06/Perch-v3.2 (Exploit)
- github.com/mertdurum06/Perch-v3.2/blob/main/Perch v3.2_Poc.txt (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-66686?
- CVE-2025-66686 is a medium-severity vulnerability in Grabaperch Perch, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-07.
- How severe is CVE-2025-66686?
- Medium severity. CVSS v3 base score is 6.1 out of 10.