Vulnerability · Published Oct 25, 2026 · Assigned by VulnCheck
CVE-2026-116208YesWiki 4.6.2 before 4.7.0 Missing Authorization in ActivityPub syncActorPosts
High 8.1
In plain English
A high-severity missing authorization in yeswiki from YesWiki. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.2%top 84.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
References
- GitHub Security Advisory (GHSA-cr64-h6xp-9g2j) vendor-advisory
- VulnCheck Advisory: YesWiki 4.6.2 before 4.7.0 Missing Authorization in ActivityPub syncActorPosts third-party-advisory