CVE-2026-6119 Overview
A Server-Side Request Forgery (SSRF) vulnerability has been identified in AstrBotDevs AstrBot versions up to and including 4.22.1. The vulnerability exists in the post_data.get function within the API Endpoint component, allowing attackers to manipulate server-side requests to access internal resources or interact with external systems on behalf of the vulnerable server.
Critical Impact
Remote attackers with low privileges can exploit this SSRF vulnerability to forge server-side requests, potentially accessing internal services, sensitive data, or pivoting to other systems within the network.
Affected Products
- AstrBotDevs AstrBot versions up to 4.22.1
Discovery Timeline
- 2026-04-12 - CVE CVE-2026-6119 published to NVD
- 2026-04-13 - Last updated in NVD database
Technical Details for CVE-2026-6119
Vulnerability Analysis
This vulnerability is classified as CWE-918 (Server-Side Request Forgery), which occurs when an application fetches a remote resource without properly validating the user-supplied URL. In AstrBot, the post_data.get function within the API Endpoint component fails to adequately validate or sanitize user-controlled input before making server-side requests.
The exploit has been publicly disclosed and is available, increasing the risk of widespread exploitation. The project maintainers were notified of the vulnerability through an issue report on GitHub, but have not yet responded.
Root Cause
The root cause of this vulnerability stems from insufficient input validation in the post_data.get function. When processing API requests, the function accepts user-supplied URL parameters without proper sanitization or allowlist validation. This allows attackers to specify arbitrary URLs, including internal network addresses, cloud metadata endpoints, or other sensitive resources that should not be accessible from external requests.
Attack Vector
The vulnerability can be exploited remotely over the network by an authenticated attacker with low-level privileges. The attack does not require user interaction and can be performed against any accessible AstrBot instance running a vulnerable version. An attacker can craft malicious requests to the vulnerable API endpoint, supplying URLs that point to internal services, localhost addresses, or cloud infrastructure metadata endpoints. The server then makes requests to these attacker-specified destinations, potentially exposing sensitive information or enabling further attacks against internal infrastructure.
Detection Methods for CVE-2026-6119
Indicators of Compromise
- Unusual outbound requests from the AstrBot server to internal IP ranges (e.g., 127.0.0.1, 10.x.x.x, 172.16.x.x, 192.168.x.x)
- API requests containing suspicious URL parameters pointing to cloud metadata endpoints (e.g., 169.254.169.254)
- Unexpected connections to internal services that AstrBot should not normally communicate with
- Error logs indicating failed connection attempts to internal or restricted addresses
Detection Strategies
- Implement network monitoring to detect anomalous outbound connections from the AstrBot server to internal network ranges
- Configure Web Application Firewall (WAF) rules to inspect and block requests containing internal IP addresses or metadata endpoints in URL parameters
- Enable verbose logging on the AstrBot API endpoint to capture and analyze all incoming requests for suspicious URL patterns
Monitoring Recommendations
- Set up alerts for any outbound connections from the AstrBot server to RFC 1918 private address spaces
- Monitor for API requests containing encoded or obfuscated URL parameters that may indicate bypass attempts
- Review application logs regularly for patterns consistent with SSRF exploitation attempts
How to Mitigate CVE-2026-6119
Immediate Actions Required
- Restrict network access to AstrBot instances from untrusted networks until a patch is available
- Implement network-level controls to prevent the AstrBot server from making connections to internal IP ranges or cloud metadata endpoints
- Review and audit all API endpoint access logs for signs of prior exploitation
- Consider temporarily disabling the affected API endpoint functionality if feasible
Patch Information
At the time of this publication, the AstrBot project has not yet responded to the vulnerability disclosure submitted via GitHub Issue #7171. Users should monitor the AstrBot GitHub repository for security updates and apply patches as soon as they become available.
Additional vulnerability details can be found in the VulDB entry.
Workarounds
- Deploy a reverse proxy or WAF in front of AstrBot to filter and validate all URL parameters in API requests
- Configure firewall rules on the AstrBot server to block outbound connections to internal networks and cloud metadata services
- Implement URL allowlisting at the application level if configuration options permit
- Limit API access to trusted IP addresses only through network access controls
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
