# CVE-2026-116208: YesWiki missing authorization in ActivityPub sync

Source: https://junglewise.ai/threats/cve-2026-116208-yeswiki-from-4-6-2-before-4-7-0-contains-a-missing-authorization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-25. Updated: 2026-10-25  
License: CC BY 4.0 with a link back

CVE-2026-116208 · Severity: high · CVSS 8.1 · Published 2026-10-25

YesWiki is a federated wiki platform that syncs content with other ActivityPub servers. An attacker running a malicious ActivityPub server can trick a YesWiki administrator into deleting, modifying, or creating wiki entries belonging to other users by serving a poisoned list of activities during a sync operation. This could result in data loss, content tampering, or fraudulent entries appearing in the wiki.

Technologies: [YesWiki](https://junglewise.ai/threats/technologies/yeswiki). Vendors: [YesWiki](https://junglewise.ai/threats/vendors/yeswiki).

## Quick answers

**Is CVE-2026-116208 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116208 being exploited in the wild.

**How severe is CVE-2026-116208?** High severity, with a CVSS score of 8.1, published 25 October 2026.

**Which products and versions are affected?** YesWiki 4.6.2 to before 4.7.0.

**Is there a fix for CVE-2026-116208?** Yes: fixed in 4.7.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-116208 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-116208?** Check whether you run YesWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 4.7.0

## Technical details

The ActivityPubService::syncActorPosts handler processes remote Create, Update, and Delete activities without authorization checks, while the inbox handler enforces assertOwns() and sameHost() guards. An attacker can craft a malicious outbox containing cross-actor activities targeting third-party entries; when an admin syncs with the attacker's actor, these activities execute without validation. The vulnerability affects Delete (no assertOwns check), Create (no sameHost check), Update (no assertOwns check), and garbage-collection logic that mass-deletes entries without per-actor verification.

## Affected products

- YesWiki YesWiki 4.6.2 to before 4.7.0

## Timeline

- 2026-10-25: disclosed
- 2026-10-09: advisory: GitHub security advisory GHSA-cr64-h6xp-9g2j published

## References

- [https://github.com/YesWiki/yeswiki/security/advisories/GHSA-cr64-h6xp-9g2j](https://github.com/YesWiki/yeswiki/security/advisories/GHSA-cr64-h6xp-9g2j)
- [https://www.vulncheck.com/advisories/yeswiki-4.6.2-before-4.7.0-missing-authorization-in-activitypub-syncactorposts](https://www.vulncheck.com/advisories/yeswiki-4.6.2-before-4.7.0-missing-authorization-in-activitypub-syncactorposts)

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