CVE-2026-3872

Name: CVE-2026-3872
Creator: NVD / NIST
Published: 2026-04-02T13:16:26.39+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 0.43%

Last modified Jun 17, 2026

CVE-2026-3872 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. A flaw was found in Keycloak. This issue allows an attacker, who controls another path on the same web server, to bypass the allowed path in redirect Uniform Resource Identifiers (URIs) that use a wildcard. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

Description

A flaw was found in Keycloak. This issue allows an attacker, who controls another path on the same web server, to bypass the allowed path in redirect Uniform Resource Identifiers (URIs) that use a wildcard. A successful attack may lead to the theft of an access token, resulting in information disclosure.

Metrics

CVSS 3.1

7.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

EPSS Probability

0.43%

34.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-601

Affected Software

Vendor	Product	Versions
Redhat	Build Of Keycloak	All versions
Redhat	Build Of Keycloak	26.2
Redhat	Build Of Keycloak	26.2.15
Redhat	Build Of Keycloak	26.4
Redhat	Build Of Keycloak	26.4.11

References

https://access.redhat.com/errata/RHSA-2026:6475Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6476Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6477Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6478Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-3872Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2445988Issue Tracking, Vendor Advisory

Timeline

Published: Apr 2, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3872?

How severe is CVE-2026-3872?

CVE-2026-3872 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3872?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3872?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST