Wiki System Vulnerability in YesWiki Affects Page Deletion Permissions
CVE-2026-52766

9.1CRITICAL

Key Information:

Vendor

Yeswiki

Status
Yeswiki
Vendor
CVE Published:
4 September 2026

What is CVE-2026-52766?

A vulnerability in YesWiki allows users with default page write access to execute the {{erasespamedcomments}} action without proper authorization checks. This can lead to permanent deletion of arbitrary wiki pages, including crucial system and user pages. The issue arises from the action's reliance on the 'suppr[]' array from POST requests, permitting any user to exploit this functionality. This vulnerability has been addressed in version 4.6.6, highlighting the importance of upgrading to secure your wiki.

Affected Version(s)

yeswiki < 4.6.6

References

https://github.com/YesWiki/yeswiki/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/YesWiki/yeswiki/commit/ed5b548a705c809...
x_refsource_MISC
https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6
x_refsource_MISC

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.