Improper Verification of Cryptographic Signature Affecting @backstage/plugin-auth-backend-module-cloudflare-access-provider package, versions >=0.1.0 <0.5.0
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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Test your applications- Snyk IDSNYK-JS-BACKSTAGEPLUGINAUTHBACKENDMODULECLOUDFLAREACCESSPROVIDER-20826425
- published11 Oct 2026
- disclosed7 Oct 2026
- creditUnknown
Introduced: 7 Oct 2026
NewCVE-2026-106457 (opens in a new tab)How to fix?
Upgrade @backstage/plugin-auth-backend-module-cloudflare-access-provider to version 0.5.0 or higher.
Overview
@backstage/plugin-auth-backend-module-cloudflare-access-provider is a The cloudflare-access-provider backend module for the auth plugin.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the jwtVerify call in helpers.ts, which verifies Cloudflare Access JWTs against the issuer but omits validation of the audience (aud) claim. An attacker who holds a valid Cloudflare Access JWT issued for a different application under the same team can present that token and gain authenticated access, because the token passes signature and issuer checks without the audience being verified.