Advisory details:
github_osv / GHSA-4x37-hw65-52w8
| Advisory ID | github_osv/GHSA-4x37-hw65-52w8 |
| Aliases |
CVE-2026-37979
|
| Summary | Keycloak: Information disclosure via OIDC token introspection endpoint audience bypass A flaw was found in Keycloak. This access control vulnerability in Keycloak's OpenID Connect (OIDC) token introspection endpoint allows a confidential client to bypass audience restrictions. An attacker-controlled client with valid credentials can retrieve sensitive token claims intended for other resource servers, compromising the confidentiality of lightweight access tokens. This issue can be exploited remotely by any confidential client in the realm with valid credentials. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 5.9 |
| Risk | 3.0 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| CWE-284 | Improper Access Control |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 6.5 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4x37-hw65-52w8/GHSA-4x37-hw65-52w8.json |
| generic_textual | MODERATE |
| Reference id | Reference type | URL |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-37979 | ||
| https://bugzilla.redhat.com/show_bug.cgi?id=2455328 | ||
| https://github.com/keycloak/keycloak | ||
| https://github.com/keycloak/keycloak/issues/49113 | ||
| https://github.com/keycloak/keycloak/releases/tag/26.6.2 | ||
| CVE-2026-37979 | https://nvd.nist.gov/vuln/detail/CVE-2026-37979 | |
| RHSA-2026:19596 | Advisory | https://access.redhat.com/errata/RHSA-2026:19596 |
| RHSA-2026:19597 | Advisory | https://access.redhat.com/errata/RHSA-2026:19597 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-19T13:39:36Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/37xxx/CVE-2026-37979.json
Source Advisory: vulnrichment/CVE-2026-37979
[{'Exploitation': 'none'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]