What is the CVSS score of CVE-2025-66686?

CVE-2025-66686 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Perch are affected by CVE-2025-66686?

Organizations using Perch CMS should be aware of moderate risk from CVE-2025-66686, a cross-site scripting vulnerability rated CVSS 6.1.

Is there a public PoC exploit available for CVE-2025-66686?

Yes, a public proof-of-concept exploit is available for CVE-2025-66686. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-66686?

Within 30 days: Identify affected systems running Perch CMS and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Perch CVE-2025-66686

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-01-07 cve@mitre.org

XSS Privilege Escalation Information Disclosure Perch

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 21, 2026 - 22:07 vuln.today

Public exploit code

CVE Published

Jan 07, 2026 - 17:16 nvd

MEDIUM 6.1

DescriptionCVE.org

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.

AnalysisAI

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Perch. 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.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

CVE-2025-66686 vulnerability details – vuln.today

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