How to fix CVE-2025-4955?

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

Is Tarteaucitron.Io affected by CVE-2025-4955?

Organizations using tarteaucitron.io WordPress should be aware of moderate risk from CVE-2025-4955, a cross-site scripting vulnerability rated CVSS 4.7. Attackers could inject scripts to steal sessions or perform actions as authenticated users. Proof-of-concept code is publicly available.

CVE-2025-4955

EUVD-2025-18664 MEDIUM

2025-06-18 [email protected]

WordPress XSS Tarteaucitron.Io PHP

4.7

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Lifecycle Timeline

patch_available

Apr 16, 2026 - 05:29 EUVD

1.9.5

EUVD ID Assigned

Mar 14, 2026 - 22:49 euvd

EUVD-2025-18664

Analysis Generated

Mar 14, 2026 - 22:49 vuln.today

PoC Detected

Jul 02, 2025 - 19:25 vuln.today

Public exploit code

CVE Published

Jun 18, 2025 - 06:15 nvd

MEDIUM 4.7

DescriptionNVD

The tarteaucitron.io WordPress plugin before 1.9.5 uses query parameters from YouTube oEmbed URLs without sanitizing these parameters correctly, which could allow users with the contributor role and above to perform Stored Cross-site Scripting attacks.

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-2025-4955 vulnerability details – vuln.today

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