| Package | Affected versions | Patched versions |
|---|---|---|
| org.springframework.security:spring-security-core | ≥ 5.1.0, < 5.1.2 | 5.1.2 |
| org.springframework.security:spring-security-oauth2-jose | ≥ 5.1.0, < 5.1.2 | 5.1.2 |
| spring framework | ≥ 5.1.0, < 5.1.2 | 5.1.2 |
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.
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