CVE-2025-6595Public exploitNetwork attack vector

Stored XSS via unescaped system messages

Published Feb 2, 2026 · Updated Feb 2, 2026

Stored XSS in Wikimedia Foundation MultimediaViewer before 1.39.13, 1.42.7, 1.43.2, and 1.44.0 allows remote attackers to run script. Several UI paths pass localized system messages to DOM HTML sinks through .html() or string concatenation without escaping. A victim must follow a crafted language URL and open an image; injected script then runs in the wiki origin and can read page data available to that session.

CVSS severity0.0
None
EPSS probability0.31%
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 Wikimedia Foundation MultimediaViewer before 1.39.13, 1.42.7, 1.43.2, and 1.44.0 allows remote attackers to run script. Several UI paths pass localized system messages to DOM HTML sinks through .html() or string concatenation without escaping. A victim must follow a crafted language URL and open an image; injected script then runs in the wiki origin and can read page data available to that session.

The record

CVE
CVE-2025-6595
Published
Feb 2, 2026
Updated
Feb 2, 2026
Vendor
Wikimedia Foundation
Product
MultimediaViewer
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 2, 2026Record 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=* <1.39.13, 1.42.7, 1.43.2, 1.44.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · MultimediaViewerversion=* <1.39.13, 1.42.7, 1.43.2, 1.44.0

Published CVSS scores

0.0Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N
4.7CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

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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