Medium severity · published Jul 1, 2026
CVE-2026-58035
Stored XSS through a system message in the codex version of Special:Block
4.8
CVSS
0.3%
EPSS
No
On KEV
Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki.
This vulnerability is associated with program files resources/src/mediawiki.Special.Block/SpecialBlock.Vue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
MediaWiki · Wikimedia Foundation
1.46.0-rc.0 before 1.46.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-58035
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-58035
Permissions Required
https://phabricator.wikimedia.org/T428809
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