Medium severity · published Oct 27, 2026
CVE-2026-116883
Semantic MediaWiki 3.1.0 before 7.3.1 Stored XSS via Schema Descriptions
New
4.8
CVSS
0.1%
EPSS
No
On KEV
Description
Semantic MediaWiki from 3.1.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows authenticated schema editors to inject HTML through schema descriptions. Attackers with the smw-schemaedit permission can save HTML that is passed unescaped to Html::rawElement() in HtmlBuilder, altering pages and targeting users who view the schema.
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)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
SemanticMediaWiki · SemanticMediaWiki
3.1.0 before 7.3.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116883
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116883
github.com
https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-2xr9-cr6h-wr6m
www.vulncheck.com
https://www.vulncheck.com/advisories/semantic-mediawiki-3.1.0-before-7.3.1-stored-xss-via-schema-descriptions
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