# CVE-2026-6662: ericc-ch copilot-api Token Endpoint server.ts cors cross-domain policy

> An attacker can bypass cross-domain restrictions in the copilot-api token endpoint due to permissive CORS settings, potentially enabling unauthorized cross-origin requests.

- **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:** 20 Apr 2026
- **Updated:** 20 Apr 2026
- **Also known as:** GHSA-6j2q-j3c7-4w55

## What is CVE-2026-6662?

CVE-2026-6662 is a medium-severity vulnerability in ericc-ch copilot-api, published on 20 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in ericc-ch copilot-api up to 0.7.0. The impacted element is the function cors of the file src/server.ts of the component Token Endpoint. Performing a manipulation results in permissive cross-domain policy with untrusted domains. It is possible to initiate the attack remotely. The exploit has been made public and could be used.

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

## Which versions are affected by CVE-2026-6662?


## How do I fix CVE-2026-6662?

No fix has been published for CVE-2026-6662 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-6662 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6662 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6662 and fix it if it is affected.

What it is: CVE-2026-6662 is a medium-severity vulnerability in ericc-ch copilot-api, published on 20 Apr 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-2026-6662 exists.

Affected product: ericc-ch copilot-api. 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-2026-6662/ (Markdown: https://insights.sbomify.com/CVE-2026-6662/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6662
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6662
- OSV: https://osv.dev/vulnerability/CVE-2026-6662

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-6662/
Summaries are generated and may contain mistakes; the official description above is the record.