CVE-2026-57852

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

State: Published
Severity: 6.3 Medium
Published: Jul 20, 2026
Updated: Jul 21, 2026
Reserved: Jun 25, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	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	VulnCheck
3.1	5.6 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L	VulnCheck

Weaknesses

CWE-303 Incorrect Implementation of Authentication Algorithm

Affected Products

Product	Versions
Grav CMS scheduler-webhook pluginTrilby Media	1.1.3 and earlierAffected 2.0.8 and earlierAffected

References

GitHub Security Advisory (GHSA-xwv3-2mv2-w33x)vendor-advisory
Product
https://www.vulncheck.com/advisories/authentication-bypass-via-null-short-circuit-in-grav-cms-scheduler-webhook-token-checkthird-party-advisory

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