Permissive Cross-domain Policy with Untrusted Domains Affecting copilot-api package, versions *
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 May 2026
- disclosed20 Apr 2026
- creditUnknown
Introduced: 20 Apr 2026
NewCVE-2026-6662 (opens in a new tab)How to fix?
There is no fixed version for copilot-api.
Overview
copilot-api is a Turn GitHub Copilot into OpenAI/Anthropic API compatible server. Usable with Claude Code!
Affected versions of this package are vulnerable to Permissive Cross-domain Policy with Untrusted Domains via the CORS policy combined with the unauthenticated /token endpoint. An attacker can gain unauthorized access to sensitive information and perform actions on behalf of users by exploiting a permissive cross-domain policy that allows requests from untrusted domains.