CVE-2023-36820

micronaut security has invalid IdTokenClaimsValidator logic on aud

MEDIUM

6.5

CVSS Score

Published: October 9, 2023 at 01:30 PM UTC

Updated: June 17, 2026 at 06:07 AM UTC

2 products affected across 2 vendorsMicronaut SecurityMicronaut Security

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.5%

SSVC

PoC

Description

Micronaut Security is a security solution for applications. Prior to versions 3.1.2, 3.2.4, 3.3.2, 3.4.3, 3.5.3, 3.6.6, 3.7.4, 3.8.4, 3.9.6, 3.10.2, and 3.11.1, IdTokenClaimsValidator skips `aud` claim validation if token is issued by same identity issuer/provider. Any OIDC setup using Micronaut where multiple OIDC applications exists for the same issuer but token auth are not meant to be shared. This issue has been patched in versions 3.1.2, 3.2.4, 3.3.2, 3.4.3, 3.5.3, 3.6.6, 3.7.4, 3.8.4, 3.9.6, 3.10.2, and 3.11.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Micronaut Security · Objectcomputing

95%

v < 3.1.23.10.0 ≤ v < 3.10.23.2.0 ≤ v < 3.2.43.3.0 ≤ v < 3.3.23.4.0 ≤ v < 3.4.33.5.0 ≤ v < 3.5.33.6.0 ≤ v < 3.6.63.7.0 ≤ v < 3.7.43.8.0 ≤ v < 3.8.43.9.0 ≤ v < 3.9.63.11.0

Affected range stops below 3.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.10.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.2.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.3.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.4.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.5.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.6.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.7.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.8.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.9.6, so it looks safe — our inference, not a vendor statement

Micronaut Security · Micronaut Projects

60%

v < 3.1.2v < 3.10.2v < 3.11.1v < 3.2.4v < 3.3.2v < 3.4.3v < 3.5.3v < 3.6.6v < 3.7.4v < 3.8.4v < 3.9.6

Affected range stops below 3.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.10.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.11.1, so it looks safe — our inference, not a vendor statement