CVE-2026-2549
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 has been found in zhanghuanhao LibrarySystem 图书馆管理系统 up to 1.1.1. This impacts an unknown function of the file BookController.java. The manipulation leads to improper access controls. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
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 confidenceImproper access control vulnerability in zhanghuanhao LibrarySystem (up to 1.1.1) affecting the BookController.java component. The vulnerability allows remote attackers to access protected functionality without proper authorization, likely due to missing or insufficient access control checks on certain controller methods.
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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/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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Confirm LibrarySystem deploymentIdentify whether zhanghuanhao LibrarySystem is installed in your environment. Check application directories, WAR files, or running services for the presence of a library management application.Affected if LibrarySystem is deployed and accessible on the system
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Determine installed versionLocate version information in the application metadata (pom.xml, build.gradle, MANIFEST.MF, or version file in the deployment). Compare against the affected range of 1.1.1 and below.Affected if Installed version is 1.1.1 or any earlier version
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Verify BookController.java is presentSearch the deployed application codebase for BookController.java or its compiled class file. Check the web application's controllers or handlers directory.Affected if BookController.java component exists in the deployment
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Inspect access control configurationExamine the application's security configuration (Spring Security XML/Java config, web.xml, or custom filter configurations) to determine which endpoints require authentication. Specifically review rules applied to BookController endpoints.Affected if BookController endpoints are accessible without authentication or have no authorization checks configured
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Test endpoint accessibilityIf possible, attempt to access BookController endpoints (such as /book/*, /books/*, or similar paths) without providing valid credentials using curl or similar tool.Affected if BookController endpoints respond successfully without authentication credentials
You are affected if running LibrarySystem version 1.1.1 or earlier with BookController.java exposed and lacking proper access control enforcement.
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 dataImplement proper authentication and authorization checks in BookController.java and similar controllers; conduct comprehensive access control review across the application to identify and remediate similar issues.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-2549 — 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-2026-2549 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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