CVE-2026-57852 | Grav CMS scheduler-webhook plugin contains an authentication… | CVSS 5.6 MEDIUM

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.

Metadata

CVE ID: CVE-2026-57852
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-25 18:48 UTC
Published: 2026-07-20 22:09 UTC
Last updated: 2026-07-20 22:09 UTC
Primary CWE: CWE-303
CWE-303 Incorrect Implementation of Authentication Algorithm
Vendor / Product: Trilby Media / Grav CMS scheduler-webhook plugin
Sources: cve.org · NVD

Severity & Metrics

5.6 MEDIUM CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
Trilby Media	Grav CMS scheduler-webhook plugin	—	0 ≤ 1.1.3, 0 ≤ 2.0.8

Weakness (CWE)

CWE	Source	Description
CWE-303	cna	CWE-303 Incorrect Implementation of Authentication Algorithm

CVSS scores (2)

Score	Severity	Version	Source	Vector
6.3	MEDIUM	4.0	cna	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
5.6	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

References (3)