# CVE-2025-8813: atjiu pybbs IndexController.java changeLanguage redirect

> Attackers can redirect users to malicious sites via the changeLanguage function in pybbs, requiring a patch to mitigate.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Aug 2025
- **Updated:** 12 Aug 2025
- **Also known as:** GHSA-r2f7-w5vx-9jgx

## What is CVE-2025-8813?

CVE-2025-8813 is a medium-severity vulnerability in atjiu pybbs, published on 10 Aug 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A vulnerability has been found in atjiu pybbs up to 6.0.0 and classified as problematic. This vulnerability affects the function changeLanguage of the file src/main/java/co/yiiu/pybbs/controller/front/IndexController.java. The manipulation of the argument referer leads to open redirect. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The patch is identified as edb14ff13e9e05394960ba46c3d31d844ff2deac. It is recommended to apply a patch to fix this issue.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2025-8813?

It affects 1 product.


Products: Pybbs Project Pybbs.

## How do I fix CVE-2025-8813?

No fix has been published for CVE-2025-8813 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-8813 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8813 exists.

## Other vulnerabilities in atjiu pybbs

- [CVE-2020-28702](https://insights.sbomify.com/CVE-2020-28702/): SQL injection in n/a (high 7.5)
- [CVE-2025-8546](https://insights.sbomify.com/CVE-2025-8546/): atjiu pybbs Verification Code login Captcha (medium 6.9)
- [CVE-2025-8547](https://insights.sbomify.com/CVE-2025-8547/): atjiu pybbs Email Verification improper authorization (medium 6.9)
- [CVE-2025-8548](https://insights.sbomify.com/CVE-2025-8548/): atjiu pybbs Registered Email SettingsApiController.java sendEmailCode information exposure (medium 6.3)
- [CVE-2025-8549](https://insights.sbomify.com/CVE-2025-8549/): atjiu pybbs UserAdminController.java update weak password (medium 6.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-8813 and fix it if it is affected.

What it is: CVE-2025-8813 is a medium-severity vulnerability in atjiu pybbs, published on 10 Aug 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8813 exists.

Affected product: atjiu pybbs. 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-2025-8813/ (Markdown: https://insights.sbomify.com/CVE-2025-8813/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-8813
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-8813
- OSV: https://osv.dev/vulnerability/CVE-2025-8813

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-8813/
Summaries are generated and may contain mistakes; the official description above is the record.