Medium severity · published Jan 7, 2026
CVE-2026-0670
Stored XSS through a system message and a user-provided parameter in ProofreadPage
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows Cross-Site Scripting (XSS).This issue affects MediaWiki - ProofreadPage Extension: 1.45, 1.44, 1.43, 1.39.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MP
MediaWiki - ProofreadPage Extension · Wikimedia Foundation
1.45; 1.44; 1.43; 1.39 · source: vendor
PP
Proofread Page · Wikisource
1.39; 1.43; 1.44; 1.45 · source: NVD
Affected product
MP
MediaWiki - ProofreadPage Extension
Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0670
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0670
Patch
https://gerrit.wikimedia.org/r/q/I7c028db5ed81843aacd596b0ee4dc2980f5b6e3c
Exploit
https://phabricator.wikimedia.org/T409423
More from MediaWiki - ProofreadPage Extension
6.9
CVE-2026-39838
ProofreadPage improperly sanitizes multiline styles using Sanitizer::checkCSS