4.3

CVE-2026-9791: redhat build_of_keycloak Incorrect Authorization

CVSS: 4.3v3.1MediumModified
AliasesCGA-3pj8-fv9g-9vr7CGA-4v9x-267m-rrr5CGA-74cp-mf65-w3rq
Published 28-05-2026Last modified 26-06-2026
Open JSON

Vulnerability summary

CVE-2026-9791 is a medium (CVSS 4.3) Incorrect Authorization vulnerability in redhat build_of_keycloak. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.6% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 28-05-2026
    PublishedVulnerability first disclosed.
  2. 26-06-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in Keycloak. An authenticated user with existing organization membership can exploit this flaw by accessing user-facing APIs, such as the account API or by requesting an OpenID Connect (OIDC) token with the 'organization' scope. This allows organization metadata to be disclosed in tokens, even after an administrator has explicitly disabled the Organizations feature, potentially leading to incorrect authorization decisions by resource servers.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

+0.16 pp

From 0.21% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard12 products
  • keycloak-26.4All versions (No fix recorded)
  • keycloak-26.4-iamguarded-compatAll versions (No fix recorded)
  • keycloak-26.5All versions (No fix recorded)
  • keycloak-26.5-iamguarded-compatAll versions (No fix recorded)
  • keycloak-fips-26.4All versions (No fix recorded)
Wolfi4 products
  • keycloak-26.4All versions (No fix recorded)
  • keycloak-26.4-iamguarded-compatAll versions (No fix recorded)
  • keycloak-26.5All versions (No fix recorded)
  • keycloak-26.5-iamguarded-compatAll versions (No fix recorded)
Org.keycloak2 products
  • keycloak-server-spi-private≥ 26.5.0, < 26.6.3 | ≤ 26.4.7
  • keycloak-services≥ 26.5.0, < 26.6.3 | ≤ 26.4.7
Redhat1 product

4 vendors · 19 products

References

15 links
Show all 15 references