PT-2026-41870 · Red Hat · Keycloak

Bzimport · Published 2026-05-19 · Updated 2026-06-03 · CVE-2026-37979

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Keycloak (affected versions not specified)

Description An access control flaw exists in the OpenID Connect (OIDC) token introspection endpoint. This issue allows a confidential client with valid credentials to bypass audience restrictions and retrieve sensitive token claims intended for other resource servers, which compromises the confidentiality of lightweight access tokens. The flaw can be exploited remotely by any confidential client within the realm.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

CVE-2026-37979

GHSA-4X37-HW65-52W8

Affected Products

Keycloak

References · 11

• https://access.redhat.com/security/cve/CVE-2026-37979 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:19597 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-4x37-hw65-52w8 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-37979 · Security Note
• https://access.redhat.com/errata/RHSA-2026:19596 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2455328 · Vendor Advisory
• https://github.com/keycloak/keycloak · Note
• https://github.com/keycloak/keycloak/releases/tag/26.6.2 · Note
• https://github.com/keycloak/keycloak/issues/49113 · Note
• https://t.me/cveNotify/165856 · Telegram Post
• https://twitter.com/dailycve/status/2062320238188740986 · Twitter Post