Medium severity · published Jan 8, 2026
CVE-2026-0671
Multiple stored i18n/message-key XSSes in UploadWizard
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 - UploadWizard extension allows Cross-Site Scripting (XSS).This issue affects MediaWiki - UploadWizard 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 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MU
MediaWiki - UploadWizard extension · Wikimedia Foundation
1.45; 1.44; 1.43; 1.39 · source: vendor
ME
Mediawiki-extensions-uploadwizard · Wikimedia
1.39; 1.43; 1.44; 1.45 · source: NVD
Affected product
MU
MediaWiki - UploadWizard extension
Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0671
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0671
Patch
https://gerrit.wikimedia.org/r/q/I16de2211594ea9a686868ad7789f9879bf981fa1
Exploit
https://phabricator.wikimedia.org/T407157
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