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Vulnerability record · CVE-2026-3872 · published 2 April 2026

CVE-2026-3872: Redhat build of keycloak open redirect vulnerability

Redhat · Build Of Keycloak

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.

7.3 CVSS 3.1 High EPSS 0.59% · top 54.1% CWE-601 · Open redirect
7.3CVSS 3.1 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
13References
15 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:6475 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6476 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6477 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6478 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-3872 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2445988 Issue TrackingVendor Advisory
https://access.redhat.com/errata/RHSA-2026:6475 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6476 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6477 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6478 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-3872 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2445988 Issue TrackingVendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3872.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-3872), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.