Read-ACL Bypass Vulnerability in YesWiki AclService Component
CVE-2026-116821

7.1HIGH

Key Information:

Vendor

Yeswiki

Status
Yeswiki
Vendor
CVE Published:
26 October 2026

What is CVE-2026-116821?

YesWiki prior to version 4.7.0 is susceptible to a read-ACL bypass vulnerability in the AclService component. This issue allows attackers who self-register to manipulate usernames that exploit SQL LIKE patterns, utilizing wildcards (_ and %) in a manner that circumvents Access Control Lists (ACLs). As a result, unauthorized users can access pages and entries that should be restricted, significantly compromising the information security of affected users and groups through the public Bazar listing API.

Affected Version(s)

yeswiki 0 < 4.7.0

yeswiki 4.7.0

References

https://github.com/YesWiki/yeswiki/security/advisories/GH...
vendor-advisory
https://github.com/YesWiki/yeswiki/commit/f3b0dd093a7ace4...
patch
https://www.vulncheck.com/advisories/yeswiki-before-4.7.0...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

manus-pi
.