CVE-2025-6738
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability, which was classified as critical, has been found in huija bicycleSharingServer up to 7b8a3ba48ad618604abd4797d2e7cf3b5ac7625a. Affected by this issue is the function userDao.selectUserByUserNameLike of the file UserServiceImpl.java. The manipulation of the argument Username leads to sql injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. This product is using a rolling release to provide continious delivery. Therefore, no version details for affected nor updated releases are available.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceSQL injection vulnerability in the userDao.selectUserByUserNameLike function within UserServiceImpl.java. The username parameter is concatenated directly into the SQL query without parameterization, allowing remote attackers to inject malicious SQL code via the username argument.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Locate the vulnerable code in your codebaseSearch your source code repository for the file UserServiceImpl.java and the method selectUserByUserNameLike. Inspect the method implementation to see if it constructs SQL queries using string concatenation with the username parameter rather than parameterized queries (PreparedStatement with bind variables).Affected if The method uses string concatenation (e.g., "SELECT * FROM users WHERE username LIKE '" + username + "'") instead of parameterized queries.
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Identify if the vulnerable function is calledSearch your codebase for any calls to userDao.selectUserByUserNameLike or similar user search methods. Check service layers, controllers, or REST endpoints that accept username input and invoke this DAO method.Affected if Your application code calls the selectUserByUserNameLike method with user-supplied input without sanitization.
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Determine if username search functionality is exposedReview your application's exposed endpoints (REST APIs, web forms, SOAP services) to identify if there is a feature that accepts a username parameter for user lookup, login, or search functionality. Check routes like /users/search, /user/find, /login, or similar.Affected if An HTTP endpoint or user interface accepts a username input that flows through to the vulnerable selectUserByUserNameLike method.
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Check database query logs for injection attemptsReview your database query logs or web application firewall (WAF) logs for unusual patterns in username fields. Look for SQL metacharacters like ', ), UNION, --, or SLEEP in username parameters that may indicate exploitation attempts.Affected if You observe SQL injection payloads in username-related request logs or database query history.
You are affected if your application contains UserServiceImpl.java with the selectUserByUserNameLike method using string concatenation in SQL queries, and this functionality is exposed through an accessible endpoint that accepts user-supplied username input.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataReplace string concatenation in SQL queries with parameterized queries (PreparedStatement) and implement proper input validation on all user-supplied parameters before database operations.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-6738 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-6738 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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