CVE-2025-4143: @cloudflare/workers-oauth-provider missing validation of redirect_uri on authorize endpoint

May 1, 2025 (updated October 31, 2025)

The OAuth implementation failed to check that redirect_uri was among the allowed set for the client_id.

References

github.com/advisories/GHSA-4pc9-x2fx-p7vj
github.com/cloudflare/workers-oauth-provider
github.com/cloudflare/workers-oauth-provider/pull/26
github.com/cloudflare/workers-oauth-provider/security/advisories/GHSA-4pc9-x2fx-p7vj
nvd.nist.gov/vuln/detail/CVE-2025-4143

Code Behaviors & Features

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