3.7

CVE-2026-4633: redhat build_of_keycloak

CVSS: 3.7v3.1LowAnalyzed
AliasesCGA-3rxq-gfqv-2fhpCGA-7jgm-f3rr-v2rfCGA-c25c-8f88-pfg4
Published 23-03-2026Last modified 01-04-2026
Open JSON

Vulnerability summary

CVE-2026-4633 is a low (CVSS 3.7) vulnerability in redhat build_of_keycloak. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.6% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
3.7/10
010
Low · v3.1 (CVE.org)
EPSS score
0.38%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-63MH-P78V-HJ5P

Timeline

  1. 23-03-2026
    PublishedVulnerability first disclosed.
  2. 01-04-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in Keycloak. A remote attacker can exploit differential error messages during the identity-first login flow when Organizations are enabled. This vulnerability allows an attacker to determine the existence of users, leading to information disclosure through user enumeration.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

+0.06 pp

From 0.32% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.38%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugzilla.redhat.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Chainguard14 products
  • keycloak-26.3-iamguarded-compatAll versions (No fix recorded)
  • keycloak-26.4All versions (No fix recorded)
  • keycloak-26.4-iamguarded-compatAll versions (No fix recorded)
  • keycloak-26.5< 26.5.7-r0
  • keycloak-26.5-iamguarded-compat< 26.5.7-r0
Wolfi4 products
  • keycloak-26.4All versions (No fix recorded)
  • keycloak-26.4-iamguarded-compatAll versions (No fix recorded)
  • keycloak-26.5< 26.5.7-r0
  • keycloak-26.5-iamguarded-compat< 26.5.7-r0
Org.keycloak1 product
  • keycloak-services≥ 26.5.0, < 26.6.1 | < 26.4.12
Redhat1 product

4 vendors · 20 products

References

8 links