TI-2026-81092 Aliases CVE-2026-116888 GHSA-xhv2-855h-ph3c

Stored cross-site scripting in SemanticMediaWiki group headings

MEDIUM 55CWE-79Published 2026-10-27 · Updated 2026-10-31

Key facts

Attack vector: Network
Privileges required: High
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

SemanticMediaWiki from 3.2.0 before 7.3.1 contains a stored cross-site scripting flaw (CWE-79) in its property group schema handling. A user with the smw-schemaedit right can save a schema whose canonical_name contains script markup, because the value is not escaped when Special:Browse renders group headings. The script runs in the sessions of users who view the page, including administrators. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

SemanticMediaWiki from 3.2.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows users with the smw-schemaedit right to inject markup through an unescaped property group schema canonical_name. Attackers can save a schema whose canonical_name holds script markup, which GroupFormatter renders unescaped in Special:Browse headings, executing JavaScript in viewers' sessions including administrators.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00148 4th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed SemanticMediaWiki (SemanticMediaWiki): 7.3.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
SemanticMediaWiki	SemanticMediaWiki	3.2.0 to before 7.3.1	7.3.1	Patch available	CNA

SemanticMediaWiki VendorSemanticMediaWiki Affected 3.2.0 to before 7.3.1 Fixed in 7.3.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:semantic-mediawiki:semantic_mediawiki::::::mediawiki::*	3.2.0 to before 7.3.1	Vulnerable	SemanticMediaWiki

cpe:2.3:a:semantic-mediawiki:semantic_mediawiki:*:*:*:*:*:mediawiki:*:* Versions 3.2.0 to before 7.3.1 Vulnerable ·SemanticMediaWiki

Remediation

Upgrade SemanticMediaWiki to 7.3.1, the fixed version.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Fix · CNA SemanticMediaWiki (SemanticMediaWiki) Fixed in 7.3.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-27
SemanticMediaWiki 7.3.1
20 records Highest priority Priority HIGH 4 HIGH, 13 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2026-81081 Resource exhaustion in Semantic MediaWiki via #set_recurring_eventPriority HIGH 77
- TI-2026-81076 Semantic MediaWiki search lets attackers exhaust CPU via long termsPriority HIGH 77
- TI-2026-81075 Uncontrolled recursion in Semantic MediaWiki via Special:AskPriority HIGH 77
Show all 20 records →

Timeline

2026-10-27 Threatist record created from CVE-2026-116888
2026-10-27 Alias added: GHSA-xhv2-855h-ph3c
2026-10-28 CVSS score added · NVD
2026-10-31 CISA SSVC decision points changed
2026-10-31 Priority changed: LOW → MEDIUM

References

Exploit 1

GitHub Security Advisory (GHSA-fp94-c5vh-cmhp)

TI-2026-81081 Resource exhaustion in Semantic MediaWiki via #set_recurring_event CVSS 4.0HIGH 8.7
TI-2026-81076 Semantic MediaWiki search lets attackers exhaust CPU via long terms CVSS 4.0HIGH 8.7
TI-2026-81075 Uncontrolled recursion in Semantic MediaWiki via Special:Ask CVSS 4.0HIGH 8.7
TI-2026-81077 Missing authorization in Semantic MediaWiki smwtask API CVSS 4.0MEDIUM 6.9
TI-2026-81084 Cross-site request forgery in Semantic MediaWiki SMWAdmin page CVSS 4.0HIGH 7.1
TI-2026-81083 Missing authorization in Semantic MediaWiki smwtask update task CVSS 4.0MEDIUM 6.9

See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences