CVE-2025-61655Network attack vector

Stored XSS via unescaped system messages

Published Feb 3, 2026 · Updated Feb 3, 2026

Stored XSS in Wikimedia Foundation VisualEditor branches before 1.39.14, 1.43.4, and 1.44.1 allows remote authenticated users to run script. The affected API, article-target, and save-dialog code sends editable system-message content into HTML rendering paths without consistently escaping or parsing it. An attacker needs high-privilege access to change system messages; opening an affected VisualEditor workflow then executes the stored script in other users' browser contexts.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
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 VisualEditor branches before 1.39.14, 1.43.4, and 1.44.1 allows remote authenticated users to run script. The affected API, article-target, and save-dialog code sends editable system-message content into HTML rendering paths without consistently escaping or parsing it. An attacker needs high-privilege access to change system messages; opening an affected VisualEditor workflow then executes the stored script in other users' browser contexts.

The record

CVE
CVE-2025-61655
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Wikimedia Foundation
Product
VisualEditor
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 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=* <1.39.14, 1.43.4, 1.44.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Wikimedia Foundation · VisualEditorversion=* <1.39.14, 1.43.4, 1.44.1

Published CVSS scores

0.0Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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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