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Vulnerability · Published Sep 30, 2026 · Assigned by wikimedia-foundation

CVE-2026-103441Unauthenticated arbitrary file deletion through Wikibase serialized entity parsing

High 7.2

In plain English

A high-severity unsafe deserialization in MediaWiki Wikibase extension from The Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 4.0)7.2High
Exploit odds (30 days)0.3%top 79.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC

Official description

Deserialization of untrusted data vulnerability in The Wikimedia Foundation MediaWiki Wikibase extension allows Leverage Executable Code in Non-Executable Files. This issue affects MediaWiki Wikibase extension: 1.46, 1.45, and 1.43.

Affected products (as reported)

VendorProductVersions
The Wikimedia Foundation MediaWiki Wikibase extension 1.461.451.43

Weakness: CWE-502 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:P/S:N/AU:Y/R:I/V:C/RE:M/U:Red

References