CVE-2025-6753 Overview
CVE-2025-6753 is a SQL injection vulnerability in huija bicycleSharingServer version 1.0. The flaw resides in the selectAdminByNameLike function within AdminController.java. An authenticated remote attacker can manipulate input parameters to inject arbitrary SQL statements against the backend database. The exploit details have been publicly disclosed, increasing the risk of opportunistic abuse against unpatched instances. The issue is classified under CWE-74: Improper Neutralization of Special Elements in Output.
Critical Impact
Authenticated remote attackers can inject SQL through the admin name search function, potentially exposing or modifying administrative user data stored in the application database.
Affected Products
- huija bicycleSharingServer 1.0
- Component: AdminController.java
- Function: selectAdminByNameLike
Discovery Timeline
- 2025-06-27 - CVE-2025-6753 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-6753
Vulnerability Analysis
The vulnerability exists in the administrative user search functionality of the bicycleSharingServer application. The selectAdminByNameLike function in AdminController.java accepts user-supplied input and passes it into a SQL query without sufficient sanitization or parameterization. Attackers with low-privilege access can supply crafted input that alters the query structure. The exploit has been publicly disclosed via the project's GitHub issue tracker and VulDB, raising the likelihood of automated scanning against exposed instances. According to the EPSS model, the probability of exploitation in the next 30 days is 0.261%.
Root Cause
The root cause is improper neutralization of special characters in a database query. The selectAdminByNameLike handler constructs a LIKE query using concatenated user input rather than parameterized statements or prepared queries with bound parameters. This allows SQL metacharacters to break out of the intended query context.
Attack Vector
The vulnerability is exploitable remotely over the network. The attacker requires low-level authenticated access to reach the admin search endpoint. By submitting a crafted name parameter containing SQL syntax, the attacker can retrieve or manipulate rows outside the intended query scope. Because the vulnerable function operates on the admin table, successful exploitation may enumerate administrator records.
No verified proof-of-concept code is republished here. Refer to the GitHub issue and VulDB Advisory #314051 for public technical details.
Detection Methods for CVE-2025-6753
Indicators of Compromise
- Unusual HTTP requests to admin controller endpoints containing SQL metacharacters such as single quotes, UNION, --, or OR 1=1.
- Application or database logs showing malformed or unexpectedly long LIKE queries against the admin table.
- Anomalous read volumes from the admin user table originating from a single session.
Detection Strategies
- Enable verbose query logging on the backend database and alert on syntactically anomalous queries targeting admin lookup functions.
- Deploy a web application firewall (WAF) rule set that flags SQL injection patterns in query and body parameters submitted to admin routes.
- Correlate authentication events with subsequent admin search requests to identify low-privilege accounts probing the endpoint.
Monitoring Recommendations
- Monitor outbound response sizes for admin search requests; sudden increases may indicate data extraction.
- Track failed and successful logins that immediately precede requests to the vulnerable endpoint.
- Baseline normal admin search traffic and alert on deviations in frequency, payload length, or character distribution.
How to Mitigate CVE-2025-6753
Immediate Actions Required
- Restrict network access to the bicycleSharingServer admin interface using firewall or reverse proxy rules until a fix is applied.
- Rotate credentials for any accounts capable of authenticating to the admin endpoint.
- Review database and application logs for prior exploitation attempts against selectAdminByNameLike.
Patch Information
No official vendor patch has been published in the referenced advisories at the time of writing. Monitor the project GitHub repository for upstream fixes. Organizations running this software should apply source-level remediation by refactoring the selectAdminByNameLike function to use parameterized queries via the underlying persistence framework.
Workarounds
- Modify AdminController.java to bind the search parameter using a prepared statement or ORM parameter binding instead of string concatenation.
- Apply input allow-listing on the admin search field, restricting characters to alphanumerics and a minimal set of safe symbols.
- Place the application behind a WAF configured with SQL injection signatures until source code changes are deployed.
- If the admin search feature is not required, disable the route in the application configuration.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
