YesWiki 4.6.2 before 4.7.0 Missing Authorization in ActivityPub syncActorPosts

Summary

YesWiki from 4.6.2 before 4.7.0 contains a missing authorization vulnerability in ActivityPubService::syncActorPosts that lets malicious ActivityPub servers manipulate other actors' mirrored entries. Attackers can serve a poisoned outbox with cross-actor Delete, Update, or Create activities during admin-initiated sync to delete, overwrite, forge, or mass-delete entries.

Remediation

1. Inventory every YesWiki yeswiki deployment, including staging.
2. Upgrade YesWiki yeswiki to 4.7.0.
3. Confirm the running version after the upgrade.

References

• Advisoryhttps://github.com/YesWiki/yeswiki/security/advisories/GHSA-cr64-h6xp-9g2j
• Advisoryhttps://www.vulncheck.com/advisories/yeswiki-4.6.2-before-4.7.0-missing-authorization-in-activitypub-syncactorposts