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  5. GHSA-88q6-jcjg-hvmw

GHSA-88q6-jcjg-hvmw: jose-swift has JWT Signature Verification Bypass via None Algorithm

January 9, 2026

An authentication bypass vulnerability allows any unauthenticated attacker to forge arbitrary JWT tokens by setting “alg”: “none” in the token header. The library’s verification functions immediately return true for such tokens without performing any cryptographic verification, enabling complete impersonation of any user and privilege escalation.

References

  • github.com/advisories/GHSA-88q6-jcjg-hvmw
  • github.com/beatt83/jose-swift
  • github.com/beatt83/jose-swift/security/advisories/GHSA-88q6-jcjg-hvmw

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Affected versions

All versions up to 6.0.1

Solution

Unfortunately, there is no solution available yet.

Impact 9.1 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-327: Use of a Broken or Risky Cryptographic Algorithm

Source file

swift/github.com/beatt83/jose-swift/GHSA-88q6-jcjg-hvmw.yml

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