Vulnerability record
CVE-2026-126561
The short answer
CVE-2026-126561 affects SemanticMediaWiki SemanticMediaWiki and is rated high (CVSS 7.1). It is not in CISA's Known Exploited Vulnerabilities catalog.
What it is
Semantic MediaWiki 2.5.0 before 7.4.1 contains a missing authorization vulnerability that allows editors without the edit-protection right to lock pages by adding an Is edit protected annotation. Attackers can add [[Is edit protected::true]] to pages or #set it in widely transcluded templates, so the TitleQuickPermissions hook blocks other editors and administrators from editing, moving or deleting them indefinitely.
Weakness: CWE-862.
Severity
7.1 high
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Exploited (CISA KEV)
Not listed
CISA lists confirmed exploitation only
EPSS, next 30 days
No score
FIRST scores CVEs within a day of publication
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- Low
- User interaction
- None
- Confidentiality impact
- None
- Integrity impact
- Low
- Availability impact
- High
Affected products
SemanticMediaWiki. NVD's record lists the exact affected versions.
References
- github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/Protection/ProtectionValidator.php#L293-L311
- github.com/SemanticMediaWiki/SemanticMediaWiki/commit/ca81329c74aa64077f367e02ad00c079458ef10a
- github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.4.1
- github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9w3p-9m8x-j2mw
- www.vulncheck.com/advisories/semantic-mediawiki-2.5.0-before-7.4.1-missing-authorization-via-is-edit-protected-annotation
Questions
Is CVE-2026-126561 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-11.
How do I fix CVE-2026-126561?
Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Received. The description is NVD's text, quoted as published.
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