CVE-2026-104445

YesWiki before 4.6.7 Authentication Bypass via ActivityPub Inbox Actor Spoofing

State: Published
Severity: 8.8 High
Published: Oct 2, 2026
Updated: Oct 6, 2026
Reserved: Oct 2, 2026

Description

YesWiki before 4.6.7 contains an authentication bypass vulnerability in the ActivityPub inbox that fails to bind the verified HTTP signature signer to the activity actor. Unauthenticated attackers with any ActivityPub keypair can send signed Delete or Update activities referencing a mirrored entry's sourceUrl to delete or overwrite other actors' federated entries.

Scores

CVSS	Score	Vector	Source
4.0	8.8 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N	VulnCheck
3.1	8.2 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L	VulnCheck

Weaknesses

CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
yeswikiYesWiki	before 4.6.7Affected 4.6.7Not affected

References

GitHub Security Advisory (GHSA-rm6r-grfg-4v78)vendor-advisory
VulnCheck Advisory: YesWiki before 4.6.7 Authentication Bypass via ActivityPub Inbox Actor Spoofingthird-party-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.