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Advisories

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

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severity
medium
date
Affecting

  • Grav CMS scheduler-webhook plugin <= 1.1.3

  • Grav CMS scheduler-webhook plugin <= 2.0.8

CWE
  • CWE-303 Incorrect Implementation of Authentication Algorithm
CVSS
6.3
CVSS V4 Vector
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
Credit
Saidakbarxon Maxsudxonov
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.

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