CVE-2026-3872

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 v3 7.3 HIGH

7.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.1 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
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 Tracking Vendor 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 Tracking Vendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3872.json

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:redhat:build_of_keycloak:-::::text-only:::
	cpe:2.3:a:redhat:build_of_keycloak:26.2::::text-only:::
	cpe:2.3:a:redhat:build_of_keycloak:26.2.15::::text-only:::
	cpe:2.3:a:redhat:build_of_keycloak:26.4::::text-only:::
	cpe:2.3:a:redhat:build_of_keycloak:26.4.11::::text-only:::

History

No history.

Information

Published : 2026-04-02 13:16

Updated : 2026-07-15 02:21

NVD link : CVE-2026-3872

Mitre link : CVE-2026-3872

CVE.ORG link : CVE-2026-3872

JSON object : View

Products Affected

redhat

build_of_keycloak

CWE

CWE-601

URL Redirection to Untrusted Site ('Open Redirect')

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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."}], "lastModified": "2026-07-15T02:21:01.680", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:text-only:*:*:*", "vulnerable": true, "matchCriteriaId": "1830E455-7E11-4264-862D-05971A42D4A6"}, {"criteria": "cpe:2.3:a:redhat:build_of_keycloak:26.2:*:*:*:text-only:*:*:*", "vulnerable": true, "matchCriteriaId": "C339EBE3-6BFD-4082-B904-4E8DB87AAE68"}, {"criteria": "cpe:2.3:a:redhat:build_of_keycloak:26.2.15:*:*:*:text-only:*:*:*", "vulnerable": true, "matchCriteriaId": "3BDF8A92-727E-401B-80BB-A141DCB39750"}, {"criteria": "cpe:2.3:a:redhat:build_of_keycloak:26.4:*:*:*:text-only:*:*:*", "vulnerable": true, "matchCriteriaId": "100AA077-7467-4F62-A8FD-88BC336972DF"}, {"criteria": "cpe:2.3:a:redhat:build_of_keycloak:26.4.11:*:*:*:text-only:*:*:*", "vulnerable": true, "matchCriteriaId": "17E79930-BE1C-4901-AF63-36B3EB149AFC"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}