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How the mentioned CVE works:
The vulnerability is a Stored Cross-Site Scripting (XSS) in the Grav application. It occurs in the /admin/config/site endpoint via the data[bash] parameter. This parameter is used for defining taxonomy types in site configuration. The application fails to validate or sanitize user input in this field. When an attacker injects malicious JavaScript code, it is stored directly on the server. The payload persists in the site configuration files. Upon rendering, the application includes the unsanitized input in HTML output. This happens when users access the site configuration or related pages. The browser interprets the injected script as part of the page. Consequently, the script executes automatically in the user’s context. Exploitation requires authentication with admin privileges. The attack vector is persistent, affecting all users viewing the compromised configuration. Injected scripts can steal cookies, hijack sessions, or redirect users. The vulnerability stems from lack of output encoding. It allows arbitrary JavaScript execution in the admin interface. This can lead to full compromise of the admin panel. Data theft and unauthorized actions are possible. Mitigation requires input validation and output escaping. The vulnerability is critical due to its impact and persistence.
Platform: Grav
Version: Unspecified
Vulnerability: Stored XSS
Severity: Critical
Date: Unknown
Prediction: Patch date unknown
What Undercode Say:
Analytics:
Curl command to exploit
curl -X POST ‘http://
-H ‘Cookie:
-d ‘data[bash]=”>‘
Payload example
“>
How Exploit:
1. Login as admin.
2. Navigate to Site Configuration.
3. Inject payload field.
4. Save configuration.
5. Trigger payload execution.
Protection from this CVE:
- Input sanitization required
- Output encoding essential
- Implement CSP headers
- Regular updates recommended
Impact:
- Session hijacking
- Credential theft
- Malware delivery
- Privilege escalation
- Data manipulation
- Reputation damage
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Sources:
Reported By: github.com
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