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Spring Security versions 5.1.x prior to 5.1.2 contain an authorization bypass vulnerability during JWT issuer validation. In order to be impacted, the same private key for an honest issuer and a malicious user must be used when signing JWTs. In that case, a malicious user could fashion signed JWTs with the malicious issuer URL that may be granted for the honest issuer.
Users of affected versions should apply the following mitigation:
There are no other mitigation steps necessary.
This issue was identified and responsibly reported by Björn Bilger.