TI-2026-81080 Aliases CVE-2026-116876 GHSA-p662-q5fq-6fm5

Missing authorization in Semantic MediaWiki lets editors lock pages

MEDIUM 64CWE-862Published 2026-10-27 · Updated 2026-10-31

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: None · Low · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Semantic MediaWiki from 2.5.0 before 7.3.1 has a missing authorization check (CWE-862) in its edit protection handling. When the $smwgEditProtectionRight setting is enabled, adding an Is edit protected annotation applies indefinite edit and move restrictions without checking the author's rights. An ordinary editor with low privileges can therefore lock pages against other editors and administrators. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

Semantic MediaWiki from 2.5.0 before 7.3.1 contains an improper authorization vulnerability that allows ordinary editors to permanently protect pages by adding an Is edit protected annotation. When $smwgEditProtectionRight is enabled, EditProtectionUpdater applies indefinite edit and move restrictions without checking the author's rights, locking other editors and administrators out.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00248 16th 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	2.5.0 to before 7.3.1	7.3.1	Patch available	CNA

SemanticMediaWiki VendorSemanticMediaWiki Affected 2.5.0 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::*	2.5.0 to before 7.3.1	Vulnerable	SemanticMediaWiki

cpe:2.3:a:semantic-mediawiki:semantic_mediawiki:*:*:*:*:*:mediawiki:*:* Versions 2.5.0 to before 7.3.1 Vulnerable ·SemanticMediaWiki

Remediation

Upgrade Semantic MediaWiki to version 7.3.1, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

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-2026-116876
2026-10-27 Alias added: GHSA-p662-q5fq-6fm5
2026-10-28 Priority changed: MEDIUM → LOW
2026-10-31 CISA SSVC decision points changed
2026-10-31 Priority changed: LOW → MEDIUM

References

Exploit 1

GitHub Security Advisory (GHSA-9824-67pm-c29j)

Patch 1

https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/d2a198f42184373bb8604450c46a13a2c28eafa3

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