High severity · published Oct 25, 2026
CVE-2026-116208
YesWiki 4.6.2 before 4.7.0 Missing Authorization in ActivityPub syncActorPosts
New
8.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
YE
yeswiki · YesWiki
4.6.2 before 4.7.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116208
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116208
github.com
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-cr64-h6xp-9g2j
www.vulncheck.com
https://www.vulncheck.com/advisories/yeswiki-4.6.2-before-4.7.0-missing-authorization-in-activitypub-syncactorposts
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