CVE-2026-109081
MEDIUM
MEDIUM
Priority: 0.03
BB Relevance:
59/100
Published: 2026-11-06
Modified: 2026-11-10
First seen: 2026-11-06
Status: active
Attack Surface
Network
Low Complexity
No Interaction
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
High
UI:
None
S:
Changed
C:
None
I:
None
A:
High
Description
A flaw was found in Keycloak. The Dynamic Client Registration (DCR) endpoint does not properly validate authorization when processing the deprecated defaultRoles field. An authenticated attacker with client creation privileges or an Initial Access Token (IAT) can inject excessive roles into the realm's default roles configuration. This causes clients across the realm to generate bloated access tokens, resulting in performance and memory degradation that can lead to a Denial of Service (DoS).
Weakness Classification (1)
References & Advisories (3)
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT