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CVE-2026-103441

HighPublished

Unauthenticated arbitrary file deletion through Wikibase serialized entity parsing

Published: Sep 30, 2026
Updated: Sep 30, 2026
Assigning CNA: wikimedia-foundation
Evidence observed: Oct 3, 2026

Primary CVSS

7.2/ 10High

nvd · CVSS 4.0

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/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:N/AU:Y/R:I/V:C/RE:M/U:Red

Summary

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.

Sources

CVE-2026-103441PoC
Local proof-of-concept and sanitized report for CVE-2026-103441, a PHP object-injection flaw in the MediaWiki action=parse API that can reach RCE via gadget chains.

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