Vulnerability · Published Feb 3, 2026 · Assigned by wikimedia-foundation

CVE-2025-61648Stored XSS through system messages in CheckUser

None 0.0

In plain English

A cross-site scripting in CheckUser from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 4.0)0.0None

Exploit odds (30 days)0.2%top 92.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files modules/ext.CheckUser.TempAccounts/components/ShowIPButton.Vue, modules/ext.CheckUser.TempAccounts/SpecialBlock.Js. This issue affects CheckUser: from * before 1.44.1.

Affected products (as reported)

Vendor	Product	Versions
Wikimedia Foundation	CheckUser	* – before 1.44.1

Weakness: CWE-79 · Vector: CVSS: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

References

https://phabricator.wikimedia.org/T402077