What is CVE-2026-57852?

CVE-2026-57852 is a medium-severity vulnerability in Trilby Media Grav Cms Scheduler-Webhook Plugin, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 5.6/10. Published 2026-07-20.

How severe is CVE-2026-57852?

Medium severity. CVSS v3 base score is 5.6 out of 10.

Vulnerability in Trilby Media Grav Cms Scheduler-Webhook Plugin

CVE-2026-57852

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.

EPSS: 0.007 (50.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Trilby Media Grav Cms Scheduler-webhook Plugin — versions 0

Weakness classification (CWE)

CWE-303 — Incorrect Implementation of Authentication Algorithm

References

disclosure@vulncheck.com
disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-57852?: CVE-2026-57852 is a medium-severity vulnerability in Trilby Media Grav Cms Scheduler-Webhook Plugin, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 5.6/10. Published 2026-07-20.
How severe is CVE-2026-57852?: Medium severity. CVSS v3 base score is 5.6 out of 10.