CVE-2026-57852

Authentication Bypass via Null Short-Circuit in Grav CMS Scheduler Webhook Token Check

Published Jul 20, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Trilby Media
Trilby Media grav Cms Scheduler-webhook Plugin
Vendors & Products Trilby Media
Trilby Media grav Cms Scheduler-webhook Plugin
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Authentication Bypass via Null Short-Circuit in Grav CMS Scheduler Webhook Token Check
Weaknesses CWE-303
References
Metrics cvssV3_1

{'score': 5.6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Jul 21, 2026, 2:55 PM
Reserved
Jun 25, 2026, 6:48 PM
Status
Deferred
Published
Jul 20, 2026, 10:17 PM
Modified
Oct 24, 2026, 8:10 PM