CVE-2026-37979

6.5 MEDIUM

A flaw was found in Keycloak

Published: 2026-05-19 · Last updated: 2026-06-03

Severity and scoring

CVSS: 6.5 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE: CWE-284

Affected products

Vendor	Product
redhat	build_of_keycloak

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-37979
[Vendor advisory]https://access.redhat.com/errata/RHSA-2026:19596
[Vendor advisory]https://access.redhat.com/errata/RHSA-2026:19597
[Vendor advisory]https://access.redhat.com/security/cve/CVE-2026-37979
[Vendor advisory]https://bugzilla.redhat.com/show_bug.cgi?id=2455328

Related CVEs

Same vendor

CVE-2026-1767 — A flaw was found in the GNOME localsearch (previously known as tracker-miners) MP3 Extractor `tracker-extract-mp3` component (5.6 MEDIUM)
CVE-2026-1766 — A flaw was found in GNOME localsearch (previously known as tracker-miners) MP3 Extractor, specifically within the tracker-extract-mp3 com... (5.6 MEDIUM)
CVE-2026-11793 — A stack buffer overflow flaw was found in 389 Directory Server (4.9 MEDIUM)
CVE-2026-11790 — A flaw was found in 389 Directory Server (4.9 MEDIUM)
CVE-2026-11789 — A flaw was found in 389 Directory Server (4.9 MEDIUM)

Same CWE

CVE-2026-47261 — Wasmtime is a runtime for WebAssembly (7.5 HIGH)
CVE-2026-50892 — Incorrect access control in the "Let's Encrypt" certificate download endpoint of Nginx Proxy Manager v2.14.0 allows authenticated attacke... (6.5 MEDIUM)
CVE-2026-50891 — Incorrect access control in the /admin/api/config component of Filestash v0.4.0 allows attackers to escalate privileges via sending a cra... (8.1 HIGH)
CVE-2026-50886 — Incorrect access control in the webhook management component of Project Firefly III v6.5.9 allows attackers to scan internal resources vi... (9.1 CRITICAL)
CVE-2026-50885 — Incorrect access control in the share-based read endpoints of Sismics Docs (Teedy) v1.11 allow unauthorized attackers to access sensitive... (7.5 HIGH)