CVE-2026-57852

MEDIUM 5.6

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

CVSS Score

5.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-303
Vendor	trilby media
Product	grav cms scheduler-webhook plugin
Published	Jul 20, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Affected Versions

Trilby Media / Grav CMS scheduler-webhook plugin

0 ≤ 1.1.3 0 ≤ 2.0.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/getgrav/grav/security/advisories/GHSA-xwv3-2mv2-w33x github.com: https://github.com/getgrav/grav vulncheck.com: https://www.vulncheck.com/advisories/authentication-bypass-via-null-short-circuit-in-grav-cms-scheduler-webhook-token-check

Credits

🔍 Saidakbarxon Maxsudxonov