Auth bypass in Yeswiki
CVE-2026-116208
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/YesWiki/yeswiki/security/advisories/GHSA-cr64-h6xp-9g2j (vendor-advisory)
- www.vulncheck.com/advisories/yeswiki-4.6.2-before-4.7.0-missing-authorization-i… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116208?
- CVE-2026-116208 is a high-severity vulnerability in Yeswiki, classified under Missing Authorization. CVSS score: 8.1/10. Published 2026-10-25.
- How severe is CVE-2026-116208?
- High severity. CVSS v3 base score is 8.1 out of 10.