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NVD / CVE Program· CNA GitHub_M

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

MediumCVSS 6.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.53% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: io.micronaut.security:micronaut-security-oauth2 (Maven) 3.1.2, 3.10.2, 3.11.1.

Low priority for now. Upgrade to io.micronaut.security:micronaut-security-oauth2 (Maven) 3.1.2, 3.10.2, 3.11.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Oct 9, 2023
Updated
Jun 17, 2026
EPSS
0.5% · 45th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
6.5
CNA · GitHub_M
4.8
1.7 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-36820

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
objectcomputingmicronaut security

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • micronaut-projects micronaut-security

    • >= 3.11.0, < 3.11.1, >= 3.10.0, < 3.10.2, >= 3.9.0, < 3.9.6, >= 3.8.0, < 3.8.4, >= 3.7.0, < 3.7.4, >= 3.6.0, < 3.6.6, >= 3.5.0, < 3.5.3, >= 3.4.0, < 3.4.3, >= 3.3.0, < 3.3.2, >= 3.2.0, < 3.2.4, >= 3.1.0, < 3.1.2affected
Affected versions · NVD (11)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • objectcomputing micronaut securitybefore 3.1.2
  • objectcomputing micronaut security3.2.0 and later · before 3.2.4
  • objectcomputing micronaut security3.3.0 and later · before 3.3.2
  • objectcomputing micronaut security3.4.0 and later · before 3.4.3
  • objectcomputing micronaut security3.5.0 and later · before 3.5.3
  • objectcomputing micronaut security3.6.0 and later · before 3.6.6
  • objectcomputing micronaut security3.7.0 and later · before 3.7.4
  • objectcomputing micronaut security3.8.0 and later · before 3.8.4
  • objectcomputing micronaut security3.9.0 and later · before 3.9.6
  • objectcomputing micronaut security3.10.0 and later · before 3.10.2
  • objectcomputing micronaut security3.11.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Mavenio.micronaut.security:micronaut-security-oauth2from 3.1.0 · before 3.1.23.1.2
Mavenio.micronaut.security:micronaut-security-oauth2from 3.10.0 · before 3.10.23.10.2
Mavenio.micronaut.security:micronaut-security-oauth2from 3.11.0 · before 3.11.13.11.1
Mavenio.micronaut.security:micronaut-security-oauth2from 3.2.0 · before 3.2.43.2.4
Mavenio.micronaut.security:micronaut-security-oauth2from 3.3.0 · before 3.3.23.3.2
Mavenio.micronaut.security:micronaut-security-oauth2from 3.4.0 · before 3.4.33.4.3
Mavenio.micronaut.security:micronaut-security-oauth2from 3.5.0 · before 3.5.33.5.3
Mavenio.micronaut.security:micronaut-security-oauth2from 3.6.0 · before 3.6.63.6.6
Mavenio.micronaut.security:micronaut-security-oauth2from 3.7.0 · before 3.7.43.7.4
Mavenio.micronaut.security:micronaut-security-oauth2from 3.8.0 · before 3.8.43.8.4
Mavenio.micronaut.security:micronaut-security-oauth2from 3.9.0 · before 3.9.63.9.6

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Maven:io.micronaut.security:micronaut-security-oauth23.1.2Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.10.2Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.11.1Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.2.4Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.3.2Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.4.3Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.5.3Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.6.6Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.7.4Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.8.4Package registry (OSV)
Maven:io.micronaut.security:micronaut-security-oauth23.9.6Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Not on record for this CVE: EPSS history · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-284 · Improper Access Control

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records