# CVE-2026-57852

## Summary

- **CVE ID:** CVE-2026-57852
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (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)
- **CWE:** CWE-303
- **Published:** Jul 20, 2026
- **Last Modified:** Jul 21, 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.

## Affected Products

- Trilby Media — Grav CMS scheduler-webhook plugin (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.69%
- **EPSS Percentile:** 50.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._