CVE-2025-62656Network attack vector

Stored XSS via editable interface message

Published Oct 20, 2025 · Updated Oct 20, 2025

Stored XSS in Wikimedia Foundation MediaWiki GlobalBlocking 1.43 and 1.44 allows remote authenticated users to execute script in viewers' browsers. Special:GlobalBlockList renders an editable interface message without neutralizing script-capable content before inserting it into the page. Interface-message editing rights are required to store the payload, and execution occurs when another user views the block list.

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 MediaWiki GlobalBlocking 1.43 and 1.44 allows remote authenticated users to execute script in viewers' browsers. Special:GlobalBlockList renders an editable interface message without neutralizing script-capable content before inserting it into the page. Interface-message editing rights are required to store the payload, and execution occurs when another user views the block list.

The record

CVE
CVE-2025-62656
Published
Oct 20, 2025
Updated
Oct 20, 2025
Vendor
Wikimedia Foundation
Product
MediaWiki GlobalBlocking
Classifications
CWE-79, CAPEC-592, T1203
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=1.43
  2. Affected versionversion=1.44

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Wikimedia Foundation · MediaWiki GlobalBlockingversion=1.43; version=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/S:N/AU:N/R:U/V:C/RE:L/U:Amber

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')
CAPEC-592Stored XSS
T1203Exploitation for Client Execution

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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