Grav CMS API Plugin Broken Access Control Leading to Account Takeover

Technical Analysis

CVE-2026-65007 stems from an authorization ordering flaw: the api plugin intercepts the apiKeyGenerate and apiKeyRevoke admin tasks before Grav's account-management ACL logic executes, and instead validates only the admin.login permission that every panel user possesses by default. An attacker with minimal panel access can therefore forge a persistent API key scoped to a higher-privileged or API-enabled account, inheriting that account's full API permission set without needing credentials or session hijacking. This is a classic broken access control / privilege escalation vulnerability (CWE-863/CWE-284 class) rather than a memory-safety or crypto issue, and exploitation requires no special tooling beyond crafting the admin task request. Organizations that expose Grav-based admin panels to their internal AI agent or automation tooling (e.g., agents that call Grav's REST API to manage content, retrieve site data for RAG pipelines, or automate CMS workflows) face direct risk, as a forged API key could grant an agent's automation credentials elevated access or allow an attacker to hijack the API key an agent relies on for authenticated CMS operations.

Affected Systems

Grav CMS installations with the grav-plugin-api (Grav API plugin) version prior to 1.0.8; specifically installs where any account holding broader API permissions coexists with lower-privileged panel users.

Indicators of Compromise

• No specific hashes, IPs, or domains published; indicators would include unexpected apiKeyGenerate/apiKeyRevoke admin task requests in Grav admin logs, unrecognized or newly created API keys bound to privileged accounts, and API activity from keys not issued through normal account-owner workflows.

Remediation Steps

1. 1

   Upgrade the API plugin

   Update grav-plugin-api to version 1.0.8 or later, which enforces proper account-management ACL checks before allowing API key generation or revocation.

2. 2

   Audit existing API keys

   Review all currently issued API keys across accounts, revoke any keys that cannot be attributed to a legitimate account-owner action, and rotate keys bound to privileged or API-enabled accounts.

3. 3

   Restrict panel access

   Limit which users are granted admin.login access and apply least-privilege principles to reduce the pool of accounts that could exploit this flaw.

4. 4

   Monitor admin task logs

   Enable and review logging of apiKeyGenerate/apiKeyRevoke task calls to detect anomalous or unauthorized key issuance.

5. 5

   Rotate agent-facing credentials

   If AI agents or automation pipelines authenticate to Grav via API keys, rotate those keys post-patch and validate that agent service accounts hold only the minimal required permissions.