Session hijacking via stored Help URL script
Published Jan 7, 2026 · Updated Jan 7, 2026
Stored XSS in Perch CMS 3.2 allows remote authenticated users with administrative privileges to inject script through the Help button URL. The settings panel stores a javascript: URL without neutralizing the scheme, and the Help button later navigates to it in another authenticated user's browser. An administrator must save the payload and a victim must click Help; the demonstrated result is same-origin script execution, enabling session theft or actions as that victim.
Summary
What happened
Stored XSS in Perch CMS 3.2 allows remote authenticated users with administrative privileges to inject script through the Help button URL. The settings panel stores a javascript: URL without neutralizing the scheme, and the Help button later navigates to it in another authenticated user's browser. An administrator must save the payload and a victim must click Help; the demonstrated result is same-origin script execution, enabling session theft or actions as that victim.
The record
- CVE
- CVE-2025-66686
- Published
- Jan 7, 2026
- Updated
- Jan 7, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-79, T1204
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jan 7, 2026CVE publishedPublication date reported by the CVE source.
- Jan 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
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Published CVSS scores
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Perch CMS 3.2 authenticated stored XSS proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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