CVE & CISA-KEV Catalog

CVE-2026-37979

MEDIUM
6.5
CVSS v3
NVD

Description

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.

CWE-284Improper Access Control

How to fix

Remediation Available
rhbk/keycloakRed Hat / RHEL
Fixed in:rhel9@sha256:81773a34d38a8df4b07344fe4ba5670d18684b3579c9d2cf8d0690bf5ec5ab40_amd64RHSA-2026:19597
Fixed in:operator-bundle@sha256:15286c44c4003e787b0bdf9a0bbc5083a2f2312eaf29ccd0c6943232ff52d729_amd64RHSA-2026:19597
Fixed in:rhel9-operator@sha256:2a81955051fb0975bfcb77d25ed64c84038d3c7293f910aeb88f9241be531f9d_amd64RHSA-2026:19597
Fixed in:rhel9@sha256:554cd90241225b6d64d0e7ada9a8ab50ae2054efdb2f5b2cbdb721475ea296df_arm64RHSA-2026:19597
Fixed in:rhel9-operator@sha256:f80c9568ff4b3cc086b7107c8e68db5f548c2b51a01dd8c79d0c9705574a180c_arm64RHSA-2026:19597
Fixed in:rhel9@sha256:68b61a98fcdfd46a166cabe097d609d65fd51181860f9ec7f691bbe5d2a986db_s390xRHSA-2026:19597
Fixed in:rhel9-operator@sha256:d915c75947df63aed99031401dbf570181dba3c5a484eb88438a27892eb7aa72_s390xRHSA-2026:19597
Fixed in:rhel9@sha256:fa7342d82f080bfe8ffaaf5ba204b98dc435897a388b1501d23a1541fe7f1272_ppc64leRHSA-2026:19597
Fixed in:rhel9-operator@sha256:d8185614aa82117680351c710a5d7b80703a9d450dd02a7becfd1405cbc5ecd5_ppc64leRHSA-2026:19597
rhbk/keycloakRocky
Fixed in:rhel9@sha256:81773a34d38a8df4b07344fe4ba5670d18684b3579c9d2cf8d0690bf5ec5ab40_amd64RHSA-2026:19597
Fixed in:operator-bundle@sha256:15286c44c4003e787b0bdf9a0bbc5083a2f2312eaf29ccd0c6943232ff52d729_amd64RHSA-2026:19597
Fixed in:rhel9-operator@sha256:2a81955051fb0975bfcb77d25ed64c84038d3c7293f910aeb88f9241be531f9d_amd64RHSA-2026:19597
Fixed in:rhel9@sha256:554cd90241225b6d64d0e7ada9a8ab50ae2054efdb2f5b2cbdb721475ea296df_arm64RHSA-2026:19597
Fixed in:rhel9-operator@sha256:f80c9568ff4b3cc086b7107c8e68db5f548c2b51a01dd8c79d0c9705574a180c_arm64RHSA-2026:19597
Fixed in:rhel9@sha256:68b61a98fcdfd46a166cabe097d609d65fd51181860f9ec7f691bbe5d2a986db_s390xRHSA-2026:19597
Fixed in:rhel9-operator@sha256:d915c75947df63aed99031401dbf570181dba3c5a484eb88438a27892eb7aa72_s390xRHSA-2026:19597
Fixed in:rhel9@sha256:fa7342d82f080bfe8ffaaf5ba204b98dc435897a388b1501d23a1541fe7f1272_ppc64leRHSA-2026:19597
Fixed in:rhel9-operator@sha256:d8185614aa82117680351c710a5d7b80703a9d450dd02a7becfd1405cbc5ecd5_ppc64leRHSA-2026:19597

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

0.37%probability of exploitation in 30 days
29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Related Vulnerabilities

Other CWE-284 (Improper Access Control) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-27350Critical9.8100%KEV + RansomFix
CVE-2019-1653High7.5100%KEV-
CVE-2023-23752Medium5.3100%KEVFix
CVE-2023-29298High7.5100%KEV-
CVE-2023-38205High7.5100%KEV-
CVE-2024-27348Critical9.899%KEVFix
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-03.