Improper Verification of Cryptographic Signature Affecting @cloudflare/workers-oauth-provider package, versions <0.0.5
Threat Intelligence
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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Test your applications- Snyk IDSNYK-JS-CLOUDFLAREWORKERSOAUTHPROVIDER-10118140
- published14 May 2025
- disclosed1 May 2025
- creditUnknown
Introduced: 1 May 2025
NewCVE-2025-4144 (opens in a new tab)How to fix?
Upgrade @cloudflare/workers-oauth-provider to version 0.0.5 or higher.
Overview
@cloudflare/workers-oauth-provider is an OAuth provider for Cloudflare Workers
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature due to the implementation of the PKCE mechanism. An attacker can bypass the PKCE protection by performing a downgrade attack. This is only exploitable if the server is configured to accept OAuth 2.0 instead of the required OAuth 2.1.