GHSA-4cwq-j7jv-qmwg

Grav vulnerable to Information Disclosure via IDOR in Grav Admin Panel

## **Summary** An **IDOR (Insecure Direct Object Reference)** vulnerability in the Grav CMS Admin Panel allows **low-privilege users to access sensitive information** from other accounts. Although direct account takeover is not possible, **admin email addresses and other metadata can be exposed**, increasing the risk of phishing, credential stuffing, and social engineering. --- ## **Details** * **Endpoint:** `/admin/accounts/users/{username}` * **Tested Version:** Grav Admin 1.7.48 * **Affected Accounts:** Authenticated users with **0 privileges** (non-privileged accounts) **Description:** Requesting another user’s account details (e.g., `/admin/accounts/users/admin`) as a low-privilege user returns an HTTP **403 Forbidden** response. However, sensitive information such as the **admin’s email address** is still present in the **response source**, specifically in the `<title>` tag. **system/src/Grav/Common/Flex/Types/Users/UserCollection.php** <img width="700" height="327" alt="Screenshot 2025-08-24 021027" src="https://github.com/user-attachments/assets/7e69ae49-d8fc-442f-b00c-9efaec706b2e" /> **system/blueprints/flex/user-accounts.yaml** <img width="700" height="300" alt="Screenshot 2025-08-24 020521" src="https://github.com/user-attachments/assets/756631c8-d60b-4b84-a08a-2a9c2f81b41f" /> This is a classic **IDOR vulnerability**, where object references (usernames) are not properly protected from unauthorized enumeration. --- ## **PoC** 1. Log in as a **non-privileged user** (0-privilege account). 2. Access another user’s endpoint, for example: ``` GET /admin/accounts/users/admin ``` 3. Observe the HTTP **403 Forbidden** response. 4. Inspect the **page source**; sensitive data such as the **admin email** can be seen in the `<title>` tag. **PoC Video:** [https://drive.google.com/file/d/1lY_qwqSkN5sPNmHvXGOk6R1mdIgVt71H/view](https://drive.google.com/file/d/1lY_qwqSkN5sPNmHvXGOk6R1mdIgVt71H/view) --- ## **Impact** * **Type:** Information Disclosure via IDOR * **Who is impacted:** Low-privilege authenticated users can enumerate other accounts and extract sensitive metadata (admin emails). * **Risk:** Exposed information can be used for targeted phishing, credential stuffing, brute-force attacks, or social engineering campaigns. * **Severity Justification:** Only a low-privilege account is required, and sensitive metadata is leaked. Arbitrary code execution is not possible, but the information exposure is **moderate risk**. --- ## **Disclosure & CVE Request** * We request a **CVE ID** for this vulnerability once validated. * Please credit the discovery to: * **Elvin Nuruyev** * **Kanan Farzalili**