Medium severity · published Sep 18, 2026
CVE-2026-77607
Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. Prior to version 7.2.0, `sep` was inserted verbatim into HTML cell joins. This made it possible to inject HTML through the separator value. Version 7.2.0 fixes the issue.
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)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
SemanticMediaWiki · SemanticMediaWiki
< 7.2.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77607
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77607
github.com
https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0
github.com
https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-7xv3-gf2g-498h
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