CVE-2026-52766

    Dashboard / Vulnerabilities / CVE-2026-52766

    CVE-2026-52766

    Published: 4 Sept 2026Last Modified: 11 Sept 2026

    Summary: YesWiki: Unauthenticated arbitrary page deletion via `{{erasespamedcomments}}` action

    Details: 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.

    References: https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52766.json, https://github.com/YesWiki/yeswiki/security/advisories/GHSA-6x7x-gcmf-7r8x, https://nvd.nist.gov/vuln/detail/CVE-2026-52766, https://github.com/YesWiki/yeswiki/commit/ed5b548a705c8091ba0282aaaba73ddda976abef

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -ed5b548a705c8091ba0282aaaba73ddda976abef

    Affected versions

    v4.6.5
    v4.6.4
    v4.6.3
    v4.6.2
    v4.6.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-52766 | CVE-DB