CVE-2026-57852

Summary

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 Software

Weaknesses

• CWE-303: CWE-303 Incorrect Implementation of Authentication Algorithm

References

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

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