Medium severity · published Sep 29, 2026
CVE-2026-103046
WikifunctionsFragmentRenderer does unsafe string replacements on user-provided HTML
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - WikiLambda extension allows Stored XSS.
This issue affects MediaWiki - WikiLambda extension: before 1.46.1.
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 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MW
Mediawiki - WikiLambda Extension · The Wikimedia Foundation
before 1.46.1 · source: vendor
Affected product
MW
Mediawiki - WikiLambda Extension
The Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103046
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103046
issue-tracking
https://phabricator.wikimedia.org/T428829
mitigation
https://gerrit.wikimedia.org/r/c/1307827
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