{"id":"CVE-2026-104445","published":"2026-10-02T12:17:15.657","lastModified":"2026-10-06T17:17:12.500","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.","cvssScore":8.2,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","cwes":["CWE-290"],"vendors":[],"products":[],"references":[{"url":"https://github.com/YesWiki/yeswiki/security/advisories/GHSA-rm6r-grfg-4v78","tags":[]},{"url":"https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-authentication-bypass-via-activitypub-inbox-actor-spoofing","tags":[]}],"exploitRefs":[{"url":"https://github.com/YesWiki/yeswiki/security/advisories/GHSA-rm6r-grfg-4v78","tags":[]}],"hasPoc":true,"ai":{"summary":"YesWiki before 4.6.7 allows unauthenticated attackers to bypass authentication by sending signed Delete or Update activities, potentially deleting or overwriting other actors' federated entries.","exploitability":"Exploitation is relatively straightforward for attackers with an ActivityPub keypair, requiring no user interaction.","blast_radius":"If exploited, this vulnerability could result in unauthorized deletion or modification of critical data across the YesWiki network.","remediation":"Upgrade to YesWiki 4.6.7 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","web","activitypub","yeswiki"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-04T08:41:30.643Z"}}