CVE-2025-62656

GlobalBlocking Special:GlobalBlockList vulnerable to message key stored XSS

5.8 Medium

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation MediaWiki GlobalBlocking extension allows Stored XSS.This issue affects MediaWiki GlobalBlocking extension: 1.43, 1.44.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: High
User interaction: Passive

What an attacker can affect

Confidentiality: High
Integrity: Low
Availability: None

Exploit likelihood

0.27%Up 0.2 points since Oct 21, 2025

What each source reports

CVE List Score used 5.8

GlobalBlocking Special:GlobalBlockList vulnerable to message key stored XSS

Record: CVE-2025-62656
CVSS 4.0: 5.8 MediumCVSS: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
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2025-35105 5.8

Record: EUVD-2025-35105
CVSS 4.0: 5.8 MediumCVSS: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
Updated: 2026-11-02

GitHub AdvisoriesGHSA-m85w-39m7-cghw 5.8

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')...

Record: GHSA-m85w-39m7-cghw
CVSS 4.0: 5.8 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:N/R:U/V:C/RE:L/U:Amber
Weakness: CWE-79
Updated: 2026-11-02

NVD 5.8

Record: CVE-2025-62656
CVSS 4.0: 5.8 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:N/R:U/V:C/RE:L/U:Amber
Weakness: CWE-79
Updated: 2026-11-02

OSVUBUNTU-CVE-2025-62656 5.8

Record: UBUNTU-CVE-2025-62656
CVSS 4.0: 5.8 MediumCVSS: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
Updated: 2026-11-02

Affected products

the wikimedia foundation mediawiki globalblocking extension

Affected packages

Affected packages
Package	Affected	Fixed
`mediawiki` Ubuntu:18.04:LTS	All versions, plus listed versions 1:1.27.3-11:1.27.4-11:1.27.4-21:1.27.4-3	None known
`mediawiki` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 1:1.31.2-1ubuntu11:1.31.5-11:1.31.5-1ubuntu11:1.31.5-21:1.31.5-3 Show 4 moreShow less 1:1.31.5-3ubuntu11:1.31.6-11:1.31.7-11:1.31.7-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 1:1.35.3-11:1.35.4-11:1.35.5-11:1.35.5-1ubuntu11:1.35.5-1ubuntu21:1.35.5-1ubuntu31:1.35.6-11:1.35.6-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 1:1.39.4-21:1.39.5-11:1.39.6-11:1.39.7-11:1.39.7-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:25.10	All versions, plus listed versions 1:1.43.1+dfsg-11:1.43.1+dfsg-21:1.43.3+dfsg-1	None known
`mediawiki` Ubuntu:26.10	All versions, plus listed versions 1:1.43.8+dfsg-21:1.43.9+dfsg-11:1.43.9+dfsg-1ubuntu1	None known
`mediawiki` Ubuntu:26.04:LTS	All versions, plus listed versions 1:1.43.3+dfsg-11:1.43.5+dfsg-11:1.43.6+dfsg-21:1.43.8+dfsg-11:1.43.8+dfsg-2	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-62656 is a medium vulnerability (CVSS 5.8) in The Wikimedia Foundation Mediawiki Globalblocking Extension, published October 20, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 19th percentile. No source names a fixed version.