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

> Unauthenticated attackers can bypass webhook authentication to trigger scheduled jobs in Grav CMS when the webhook token is unconfigured.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Aug 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-3m6r-m23g-m2w9

## What is CVE-2026-11430?

CVE-2026-11430 is a medium-severity authentication bypass vulnerability in Trilby Media getgrav/grav, published on 7 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-303 (Incorrect Implementation of Authentication Algorithm)

## Which versions are affected by CVE-2026-11430?


## How do I fix CVE-2026-11430?

No fix has been published for CVE-2026-11430 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11430 being exploited?

There is no known exploitation of CVE-2026-11430 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11430 and fix it if it is affected.

What it is: CVE-2026-11430 is a medium-severity authentication bypass vulnerability in Trilby Media getgrav/grav, published on 7 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-11430 in the wild and no public exploit code.

Affected product: Trilby Media getgrav/grav. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-11430/ (Markdown: https://insights.sbomify.com/CVE-2026-11430/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11430
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11430
- OSV: https://osv.dev/vulnerability/CVE-2026-11430

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11430/
Summaries are generated and may contain mistakes; the official description above is the record.