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CVE-2023-36820

20
FAUCET Score

CVE-2023-36820 is a medium-severity vulnerability in Micronaut Security versions prior to 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. The vulnerability stems from the IdTokenClaimsValidator incorrectly skipping the "aud" claim validation when an OIDC token is issued by the same identity provider, potentially allowing unauthorized token sharing between different OIDC applications. With a CVSS score of 6.5 (Medium), this flaw has a network attack vector and low impact on confidentiality and integrity, with no authentication required for exploitation. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.1.2CPE matchmatch criteria
cpe:2.3:a:objectcomputing:micronaut_security:*:*:*:*:*:*:*:*
>= 3.2.0, < 3.2.4CPE matchmatch criteria
cpe:2.3:a:objectcomputing:micronaut_security:*:*:*:*:*:*:*:*
>= 3.3.0, < 3.3.2CPE matchmatch criteria
cpe:2.3:a:objectcomputing:micronaut_security:*:*:*:*:*:*:*:*
>= 3.4.0, < 3.4.3CPE matchmatch criteria
cpe:2.3:a:objectcomputing:micronaut_security:*:*:*:*:*:*:*:*
>= 3.5.0, < 3.5.3CPE matchmatch criteria
cpe:2.3:a:objectcomputing:micronaut_security:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.45%
Probability of exploitation in next 30 days
EPSS Percentile
36.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0045 is in the 23rd percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (12)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.11.1
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.10.2
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.9.6
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.8.4
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.7.4
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.6.6
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.5.3
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.4.3
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.3.2
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.2.4
mavenpatch availablevia ghsa
Product: io.micronaut.security:micronaut-security-oauth2Fixed in: 3.1.2

Vendor Advisories (1)

mavenGHSA-qw22-8w9r-864hmedium

io.micronaut.security:micronaut-security-oauth2 has invalid IdTokenClaimsValidator logic on aud

Oct 5, 2023

References

github.com / micronaut-projects/micronaut-security/commit/9728b925221a0d87798ccf250657a3c214b7e980
Patch
github.com / micronaut-projects/micronaut-security/security/advisories/GHSA-qw22-8w9r-864h
ExploitMitigationThird Party Advisory