5.8

CVE-2026-4366: redhat build_of_keycloak Server-Side Request Forgery (SSRF)

CVSS: 5.8v3.1MediumModified
Published 18-03-2026Last modified 09-06-2026
Open JSON

Vulnerability summary

CVE-2026-4366 is a medium (CVSS 5.8) Server-Side Request Forgery (SSRF) vulnerability in redhat build_of_keycloak. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 33.3% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · +0.18 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-03-2026
    PublishedVulnerability first disclosed.
  2. 09-06-2026
    Last modifiedVulnerability information updated.

Description

A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

+0.18 pp

From 0.23% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.41%

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

Redhat4 products

1 vendor · 4 products

References

4 links