Missing Authorization Vulnerability in YesWiki Affects Multiple Versions
CVE-2026-116208

7.2HIGH

Key Information:

Vendor

Yeswiki

Status
Yeswiki
Vendor
CVE Published:
25 October 2026

What is CVE-2026-116208?

YesWiki versions prior to 4.7.0 contain a vulnerability in the ActivityPubService, specifically within the syncActorPosts function. This flaw allows malicious ActivityPub servers to exploit a missing authorization check, enabling them to manipulate mirrored entries of other actors. By serving a contaminated outbox during admin-initiated syncs, attackers can execute unwanted Delete, Update, or Create activities. As a result, sensitive entries may be deleted, overwritten, forged, or even mass-deleted without proper authorization.

Affected Version(s)

yeswiki 4.6.2 < 4.7.0

yeswiki 4.7.0

References

https://github.com/YesWiki/yeswiki/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/yeswiki-4.6.2-before...
third-party-advisory

CVSS V4

Score:
7.2
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

manus-use
.