CVE-2026-57852 MEDIUM

CVE-2026-57852: Authentication Bypass via Null Short-Circuit in Grav CMS Scheduler Webhook Token Check

Vendor Trilby Media
Product Grav CMS scheduler-webhook plugin
Weakness CWE-303
Published July 20, 2026
Last update July 21, 2026

CVSS base score

5.6/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

What the vulnerability does

01Description

Grav CMS scheduler-webhook plugin contains an authentication bypass vulnerability that allows unauthenticated remote attackers to trigger configured scheduled jobs by exploiting a short-circuit logic flaw in the webhook token validation. Attackers can send a single unauthenticated POST request to the scheduler webhook endpoint to execute all configured scheduled jobs or target a specific job, causing unintended execution of operator-defined commands under the web server process user.

Key dates

02Disclosure timeline

July 20, 2026 CVE published
July 21, 2026 Record updated