How to fix CVE-2025-3662?

Within 30 days: Identify affected systems running before 3.3.6 does not escape captions and titles attributes and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Is Fancybox affected by CVE-2025-3662?

Organizations using before 3.3.6 does not escape captions and titles attributes should be aware of moderate risk from CVE-2025-3662, a cross-site scripting vulnerability rated CVSS 6.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users.

CVE-2025-3662

EUVD-2025-16698 MEDIUM

2025-06-03 [email protected]

WordPress XSS Fancybox PHP

6.1

CVSS 3.1

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

patch_available

Apr 16, 2026 - 05:29 EUVD

3.3.6

Analysis Generated

Mar 14, 2026 - 17:04 vuln.today

EUVD ID Assigned

Mar 14, 2026 - 17:04 euvd

EUVD-2025-16698

PoC Detected

Jun 05, 2025 - 14:09 vuln.today

Public exploit code

CVE Published

Jun 03, 2025 - 06:15 nvd

MEDIUM 6.1

DescriptionNVD

The FancyBox for WordPress plugin before 3.3.6 does not escape captions and titles attributes before using them to populate galleries' caption fields. The issue was received as a Contributor+ Stored XSS, however one of our researcher (Marc Montpas) escalated it to an Unauthenticated Stored XSS

AnalysisAI

Technical ContextAI

Cross-site scripting (XSS) allows injection of client-side scripts into web pages viewed by other users due to insufficient output encoding.

RemediationAI

Encode all user-supplied output contextually (HTML, JS, URL). Implement Content Security Policy (CSP) headers. Use HTTPOnly and Secure cookie flags.

CVE-2025-3662 vulnerability details – vuln.today

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