CVE-2025-62657Network attack vector

Stored XSS via unescaped system messages

Published Oct 20, 2025 · Updated Oct 20, 2025

Stored XSS in Wikimedia Foundation Page Forms 1.44 allows remote authenticated users to execute script in another user's browser. Page Forms inserts administrator-controlled MediaWiki system-message content into generated page markup without escaping active HTML. High-privilege message-editing access and a victim loading the affected interface are required; the payload runs within the victim's wiki origin.

CVSS severity5.8
Medium
EPSS probability0.25%
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 Page Forms 1.44 allows remote authenticated users to execute script in another user's browser. Page Forms inserts administrator-controlled MediaWiki system-message content into generated page markup without escaping active HTML. High-privilege message-editing access and a victim loading the affected interface are required; the payload runs within the victim's wiki origin.

The record

CVE
CVE-2025-62657
Published
Oct 20, 2025
Updated
Oct 20, 2025
Vendor
Wikimedia Foundation
Product
Page Forms
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 20, 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=1.44

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Wikimedia Foundation · Page Formsversion=1.44

Published CVSS scores

5.8Wikimedia FoundationCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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.

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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')
CAPEC-592Stored XSS
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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