CVE-2026-62668 getgrav CVE debrief

Who should care

Administrators and users of Grav CMS with the Grav API plugin installed, particularly those with api.webhooks.write access, should assess exposure and apply the patch to prevent potential abuse.

Why it matters

CVE-2026-62668 is a critical vulnerability in the Grav API Plugin that allows for potential data exfiltration, unauthorized access, and pivot requests to internal services. Administrators and users with api.webhooks.write access should assess exposure and apply the patch to prevent potential abuse.

• Potential data exfiltration through local file retrieval
• Possible pivot requests to internal services or cloud metadata endpoints
• Risk of unauthorized access to sensitive information
• Need for verification of current version and exposure

Technical summary

The Grav API Plugin WebhookController.php accepts webhook URLs after only FILTER_VALIDATE_URL syntax validation, and WebhookDispatcher.php initializes cURL without CURLOPT_PROTOCOLS or CURLOPT_REDIR_PROTOCOLS restrictions. This allows an account with api.webhooks.write to submit file, dict, gopher, private-network, or link-local targets, retrieve local files and delivery response bodies, and pivot requests to internal services or cloud metadata endpoints.

Defensive priority

High

Recommended defensive actions

• Review and apply the patch to upgrade to version 1.0.6
• Restrict access to the Grav API plugin WebhookController.php
• Monitor for suspicious webhook requests
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the Grav API Plugin vulnerability. The issue is fixed in version 1.0.6. Evidence is limited to public CVE and NVD records. Defenders should verify current version and exposure, review webhook request logs for suspicious activity, and ensure api.webhooks.write access is restricted. The CVE Program and NVD provide official source information.

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.