# CVE-2025-0869: Cianet ONU GW24AC Login cross site scripting

> Remote attackers can execute arbitrary scripts via the browserLang parameter in the Cianet ONU GW24AC login interface.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 Jan 2025
- **Updated:** 7 Feb 2025
- **Also known as:** GHSA-67rj-3hx7-hcvv

## What is CVE-2025-0869?

CVE-2025-0869 is a medium-severity cross-site scripting vulnerability in Cianet ONU GW24AC, published on 30 Jan 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability was found in Cianet ONU GW24AC up to 20250127. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the component Login. The manipulation of the argument browserLang leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2025-0869?


## How do I fix CVE-2025-0869?

No fix has been published for CVE-2025-0869 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-0869 being exploited?

There is no known exploitation of CVE-2025-0869 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-0869 and fix it if it is affected.

What it is: CVE-2025-0869 is a medium-severity cross-site scripting vulnerability in Cianet ONU GW24AC, published on 30 Jan 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-0869 in the wild and no public exploit code.

Affected product: Cianet ONU GW24AC. 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-2025-0869/ (Markdown: https://insights.sbomify.com/CVE-2025-0869/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-0869
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-0869
- OSV: https://osv.dev/vulnerability/CVE-2025-0869

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-0869/
Summaries are generated and may contain mistakes; the official description above is the record.