What’s Vulnerable › Vulnerabilities

CVE-2026-57852: Authentication Bypass via Null Short-Circuit in Grav CMS Scheduler Webhook Token Check

• Severity: medium (CVSS 5.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-20 · updated 2026-10-24
• Weakness: CWE-303

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: through 1.1.3; through 2.0.8

References

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

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