CVE-2026-11430 Trilby Media CVE debrief

Who should care

Operators of Grav CMS with the scheduler-webhook plugin installed and configured, particularly those with scheduler.modern.webhook.enabled set to true and no webhookToken configured, should verify their configuration and ensure proper authentication is in place. This includes reviewing and updating Grav CMS and plugin versions to ensure latest security patches and monitoring for unusual activity on affected systems. Additionally, security teams and vulnerability management teams should be aware of the potential impact and review compensating controls for exposed systems while remediation is scheduled and verified. Asset inventory and configuration management teams should also be involved in verifying affected scope and ensuring proper mitigations are in place. IT operations and change management teams should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Monitoring and incident response teams should check relevant monitoring, detection, and logs for exposed assets that need extra review. Configuration management and compliance teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. Business stakeholders and risk management teams should be aware of the potential operational impact and review context to prioritize and resource remediation efforts. Communication and training teams should ensure that affected teams are aware of the vulnerability and the necessary actions to take. The CVE record indicates an authentication bypass in the Grav CMS scheduler-webhook plugin, which can be triggered by sending a POST request to /scheduler/webhook. The attack requires the scheduler-webhook plugin to be installed and configured with scheduler.modern.webhook.enabled set to true and no webhookToken to be configured. Evidence is based on official CVE and NVD records, as well as references from Vulncheck. The CVE record was published on 2026-08-07T19:17:34.497Z and has not been modified since then. The NVD and CVE Program records provide official details on the vulnerability. Additional sources, including Vulncheck, provide further context and analysis. To verify the 3

Technical summary

The Grav CMS scheduler-webhook plugin contains an authentication bypass vulnerability. When the webhook feature is enabled but no webhookToken is configured, an unauthenticated remote attacker can trigger scheduled jobs by sending a POST request to /scheduler/webhook. The attacker controls when the jobs run and which one runs, but not 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.

Defensive priority

Operators of Grav CMS with the scheduler-webhook plugin should verify their configuration and ensure proper authentication is in place.

Recommended defensive actions

• Verify scheduler-webhook plugin configuration and ensure proper authentication is in place
• Review and update Grav CMS and plugin versions to ensure latest security patches
• Monitor for unusual activity on affected systems
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE-2026-11430 record indicates an authentication bypass in the Grav CMS scheduler-webhook plugin. When the webhook feature is enabled but no webhookToken is configured, an unauthenticated remote attacker can trigger scheduled jobs. The attack requires the scheduler-webhook plugin to be installed and configured with scheduler.modern.webhook.enabled set to true. Evidence is based on official CVE and NVD records, as well as references from Vulncheck.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.