# CVE-2026-6143: farion1231 cc-switch ProxyServer server.rs cross-domain policy

> Remote attackers can bypass cross-domain policies in cc-switch ProxyServer, allowing unauthorized cross-origin requests from untrusted domains.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/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:** Not needed
- **Fix available:** No
- **Published:** 13 Apr 2026
- **Updated:** 13 Apr 2026
- **Also known as:** GHSA-rrm6-2q2p-cpx5

## What is CVE-2026-6143?

CVE-2026-6143 is a medium-severity vulnerability in farion1231 cc-switch, published on 13 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A security flaw has been discovered in farion1231 cc-switch up to 3.12.3. Affected by this issue is some unknown functionality of the file src-tauri/src/proxy/server.rs of the component ProxyServer. The manipulation results in permissive cross-domain policy with untrusted domains. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Weakness: CWE-942 (Permissive Cross-domain Security Policy with Untrusted Domains), CWE-346 (Origin Validation Error)

## Which versions are affected by CVE-2026-6143?


## How do I fix CVE-2026-6143?

No fix has been published for CVE-2026-6143 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-6143 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6143 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6143 and fix it if it is affected.

What it is: CVE-2026-6143 is a medium-severity vulnerability in farion1231 cc-switch, published on 13 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6143 exists.

Affected product: farion1231 cc-switch. 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-2026-6143/ (Markdown: https://insights.sbomify.com/CVE-2026-6143/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6143
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6143
- OSV: https://osv.dev/vulnerability/CVE-2026-6143

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6143/
Summaries are generated and may contain mistakes; the official description above is the record.