CVE-2025-46558Public exploitNetwork attack vector

Stored XSS via raw HTML events

Published Apr 30, 2025 · Updated Apr 30, 2025

Stored XSS in XWiki Contrib's XWiki Markdown Syntax 8.2 through 8.8 allows remote authenticated users to run JavaScript in visitors' browsers. HTMLNodeVisitor sends flexmark HTML nodes to XWiki's rendering listener as raw HTML events, bypassing the HTML macro's security checks. Any user who can save a Markdown document or comment can plant the payload; execution requires another user to view it, and an administrator or programming-rights victim exposes the entire installation.

CVSS severity9.0
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in XWiki Contrib's XWiki Markdown Syntax 8.2 through 8.8 allows remote authenticated users to run JavaScript in visitors' browsers. HTMLNodeVisitor sends flexmark HTML nodes to XWiki's rendering listener as raw HTML events, bypassing the HTML macro's security checks. Any user who can save a Markdown document or comment can plant the payload; execution requires another user to view it, and an administrator or programming-rights victim exposes the entire installation.

The record

CVE
CVE-2025-46558
Published
Apr 30, 2025
Updated
Apr 30, 2025
Vendor
XWiki Contrib
Product
XWiki Markdown Syntax
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 8.2, < 8.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

XWiki Contrib · XWiki Markdown Syntaxversion=>= 8.2, < 8.9

Published CVSS scores

9.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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