CVE-2026-51775 Overview
CVE-2026-51775 is a SQL injection vulnerability affecting Fastadmin version 1.6.1.20250430. The flaw resides in the application/common/controller/Backend.php component. Attackers can inject arbitrary SQL statements through this component, which can lead to arbitrary code execution against the backing database context.
Fastadmin is a PHP-based rapid application development framework widely used to build administrative backends. Because the vulnerable component sits in the backend controller path, exploitation can expose administrative data and downstream application logic.
Critical Impact
Successful exploitation allows attackers to execute arbitrary SQL and, per the advisory, arbitrary code via the Fastadmin backend controller, exposing application data and administrative functionality.
Affected Products
- Fastadmin version 1.6.1.20250430
- application/common/controller/Backend.php component
- Deployments exposing the Fastadmin backend interface
Discovery Timeline
- 2026-08-03 - CVE-2026-51775 published to NVD
- 2026-08-03 - Last updated in NVD database
Technical Details for CVE-2026-51775
Vulnerability Analysis
CVE-2026-51775 is a SQL injection flaw [CWE-89] in the Fastadmin backend controller. The application/common/controller/Backend.php component processes user-supplied input without adequate sanitization or parameterization. Attacker-controlled data reaches SQL query construction, enabling manipulation of query structure.
According to the Gitee Security Advisory, the flaw allows an attacker to execute arbitrary code by leveraging the injection point. Depending on database privileges and Fastadmin configuration, impact can extend from data disclosure and modification to command execution through database features or downstream application logic.
Root Cause
The root cause is improper neutralization of special elements used in SQL commands. Input handled by Backend.php is concatenated into SQL statements rather than bound as parameters. Any request path that reaches the vulnerable controller logic can carry a malicious payload into the query builder.
Attack Vector
The attack targets HTTP requests processed by the Fastadmin backend controller. An attacker submits crafted parameters that break out of the intended query context and append attacker-controlled SQL. The advisory does not enumerate authentication requirements, so administrators should assume the backend surface is reachable to any actor who can invoke the controller.
The vulnerability mechanism is described in prose because no verified proof-of-concept code has been published. Refer to the Gitee Security Advisory for advisory details.
Detection Methods for CVE-2026-51775
Indicators of Compromise
- HTTP requests to Fastadmin backend routes containing SQL metacharacters such as ', ", --, /*, UNION, or SLEEP(
- Database error messages returned in HTTP responses from the Backend.php controller
- Unexpected SELECT, UPDATE, or INFORMATION_SCHEMA queries in database logs originating from the Fastadmin application user
- Newly created administrator accounts or modified role assignments in the Fastadmin database
Detection Strategies
- Deploy web application firewall rules that inspect requests to Fastadmin backend endpoints for SQL injection patterns
- Enable MySQL or MariaDB general query logging on Fastadmin databases and alert on time-based payloads such as SLEEP, BENCHMARK, or WAITFOR
- Correlate spikes in HTTP 500 responses from the backend controller with corresponding database errors
Monitoring Recommendations
- Ingest Fastadmin web server and database logs into a centralized SIEM for query pattern analysis
- Monitor authentication events and privilege changes on administrative accounts for anomalies
- Track outbound network activity from the Fastadmin host to detect post-exploitation callbacks
How to Mitigate CVE-2026-51775
Immediate Actions Required
- Restrict access to the Fastadmin backend interface to trusted networks or VPN users
- Audit database user privileges to enforce least privilege for the Fastadmin application account
- Review recent access logs to the backend controller for indicators of exploitation attempts
- Rotate administrative credentials and database secrets if compromise is suspected
Patch Information
No vendor patch is referenced in the enriched CVE data at the time of publication. Monitor the Gitee Security Advisory and the Fastadmin project for a fixed release addressing the application/common/controller/Backend.php component.
Workarounds
- Place Fastadmin behind a web application firewall with SQL injection signatures enabled
- Disable or firewall the backend controller path if it is not required for production operations
- Enforce input validation and parameterized queries in any custom Fastadmin extensions until an official fix is available
- Restrict database account privileges to prevent file operations and stacked queries where possible
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
