# CVE-2025-6533: xxyopen/201206030 novel-plus CATCHA LoginController.java ajaxLogin authentication replay

> Attackers can bypass authentication in novel-plus by replaying captured login requests, potentially gaining unauthorized access to user accounts.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/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:** 24 Jun 2025
- **Updated:** 25 Jun 2025
- **Also known as:** GHSA-m4cp-r954-7x4c

## What is CVE-2025-6533?

CVE-2025-6533 is a medium-severity authentication bypass vulnerability in Xxyopen Novel-Plus, published on 24 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability, which was classified as critical, has been found in xxyopen/201206030 novel-plus up to 5.1.3. Affected by this issue is the function ajaxLogin of the file novel-admin/src/main/java/com/java2nb/system/controller/LoginController.java of the component CATCHA Handler. The manipulation leads to authentication bypass by capture-replay. The attack may be launched remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts), CWE-294 (Authentication Bypass by Capture-replay), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2025-6533?

It affects 1 product.


Products: Xxyopen Novel-Plus.

## How do I fix CVE-2025-6533?

No fix has been published for CVE-2025-6533 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-6533 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6533 exists.

## Other vulnerabilities in Xxyopen Novel-Plus

- [CVE-2025-45890](https://insights.sbomify.com/CVE-2025-45890/): Path traversal in n/a (critical 9.8)
- [CVE-2024-25274](https://insights.sbomify.com/CVE-2024-25274/): File upload in n/a (critical 9.8)
- [CVE-2024-24014](https://insights.sbomify.com/CVE-2024-24014/): SQL injection in n/a (critical 9.8)
- [CVE-2024-24018](https://insights.sbomify.com/CVE-2024-24018/): SQL injection in n/a (critical 9.8)
- [CVE-2024-24021](https://insights.sbomify.com/CVE-2024-24021/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-6533 and fix it if it is affected.

What it is: CVE-2025-6533 is a medium-severity authentication bypass vulnerability in Xxyopen Novel-Plus, published on 24 Jun 2025. 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-2025-6533 exists.

Affected product: Xxyopen Novel-Plus. 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-2025-6533/ (Markdown: https://insights.sbomify.com/CVE-2025-6533/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-6533
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-6533
- OSV: https://osv.dev/vulnerability/CVE-2025-6533

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-6533/
Summaries are generated and may contain mistakes; the official description above is the record.