CVE-2026-101333

What it is

A flaw was found in the Micrometer user-event metrics listener of Keycloak, a solution for integrated identity and access management. The issue occurs when the listener is configured to include the idp tag. An unauthenticated attacker can send requests to the identity broker login endpoint using arbitrary provider aliases, causing the system to create an unlimited number of metric time series. This can lead to excessive memory consumption and degrade the performance of both the server and its monitoring tools.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-09-28 15:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-28 16:26 UTC Last updatedMost recent change to the record

Details

Published

2026-09-28 15:17 UTC

Last modified

2026-09-28 16:26 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-770 · Allocation without limits

Record status

Awaiting Analysis

Attack profile CVSS 3.1 · 3.7

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low