# CVE-2026-2549: zhanghuanhao LibrarySystem 图书馆管理系统 BookController.java access control

> Remote attackers can bypass access controls in the BookController to read or modify library data without proper authorization.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Feb 2026
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-59w9-4rgj-869h

## What is CVE-2026-2549?

CVE-2026-2549 is a medium-severity missing authorization vulnerability in zhanghuanhao LibrarySystem 图书馆管理系统, published on 16 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A 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.

Weakness: CWE-284 (Improper Access Control), CWE-266 (Incorrect Privilege Assignment)

## Which versions are affected by CVE-2026-2549?


## How do I fix CVE-2026-2549?

No fix has been published for CVE-2026-2549 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2549 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2549 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2549 and fix it if it is affected.

What it is: CVE-2026-2549 is a medium-severity missing authorization vulnerability in zhanghuanhao LibrarySystem 图书馆管理系统, published on 16 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2549 exists.

Affected product: zhanghuanhao LibrarySystem 图书馆管理系统. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-2549/ (Markdown: https://insights.sbomify.com/CVE-2026-2549/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2549
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2549
- OSV: https://osv.dev/vulnerability/CVE-2026-2549

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-2549/
Summaries are generated and may contain mistakes; the official description above is the record.