How to fix CVE-2025-46558?

Within 24 hours: Identify all affected systems running Markdown. In and apply vendor patches immediately. Verify anti-CSRF tokens and content security policies are enforced.

Is Xwiki affected by CVE-2025-46558?

Organizations using Markdown. In face critical risk from CVE-2025-46558, a cross-site scripting vulnerability rated CVSS 9.0. Attackers could inject malicious scripts to steal user sessions, credentials, or perform actions on behalf of authenticated users.

CVE-2025-46558

CRITICAL

2025-04-30 [email protected]

9.0

CVSS 3.1

CVSS Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:39 vuln.today

Patch Released

Mar 28, 2026 - 18:39 nvd

Patch available

PoC Detected

Aug 26, 2025 - 16:28 vuln.today

Public exploit code

CVE Published

Apr 30, 2025 - 19:15 nvd

CRITICAL 9.0

Description

XWiki Contrib's Syntax Markdown allows importing Markdown content into wiki pages and creating wiki content in Markdown. In versions starting from 8.2 to before 8.9, the Markdown syntax is vulnerable to cross-site scripting (XSS) through HTML. In particular, using Markdown syntax, it's possible for any user to embed Javascript code that will then be executed on the browser of any other user visiting either the document or the comment that contains it. In the instance that this code is executed by a user with admins or programming rights, this issue compromises the confidentiality, integrity and availability of the whole XWiki installation. This issue has been patched in version 8.9.

Analysis

XWiki Contrib's Syntax Markdown allows importing Markdown content into wiki pages and creating wiki content in Markdown. Rated critical severity (CVSS 9.0), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.

Technical Context

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. XWiki Contrib's Syntax Markdown allows importing Markdown content into wiki pages and creating wiki content in Markdown. In versions starting from 8.2 to before 8.9, the Markdown syntax is vulnerable to cross-site scripting (XSS) through HTML. In particular, using Markdown syntax, it's possible for any user to embed Javascript code that will then be executed on the browser of any other user visiting either the document or the comment that contains it. In the instance that this code is executed by a user with admins or programming rights, this issue compromises the confidentiality, integrity and availability of the whole XWiki installation. This issue has been patched in version 8.9. Affected products include: Xwiki. Version information: before 8.9.

Affected Products

Xwiki.

Remediation

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +3.0

CVSS: +45

POC: +20

CVE-2025-46558 vulnerability details – vuln.today

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CVE-2025-46558

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CVE-2025-46558

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