# CVE-2026-52766

## Summary

- **CVE ID:** CVE-2026-52766
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H)
- **CWE:** CWE-276, CWE-862
- **Published:** Sep 4, 2026
- **Last Modified:** Sep 9, 2026

## Description

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, the {{erasespamedcomments}} wiki action (actions/EraseSpamedCommentsAction.php) accepts a suppr[] array from POST and deletes every wiki page whose tag appears in that array, with no authorization check anywhere in the action body or in the page-deletion path it invokes. Combined with YesWiki's allow-by-default action ACL model, any user who has page write access, which is the default for everyone (default_write_acl='*') on a fresh install can permanently delete arbitrary wiki pages, including the front page, admin pages, and pages owned by other users. This issue has been patched in version 4.6.6.

## Affected Products

- YesWiki — yeswiki (< 4.6.6)

## References

- [CNA](https://github.com/YesWiki/yeswiki/security/advisories/GHSA-6x7x-gcmf-7r8x)
- [CNA](https://github.com/YesWiki/yeswiki/commit/ed5b548a705c8091ba0282aaaba73ddda976abef)
- [CNA](https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 26.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._