CVE-2026-3872
High
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.
SeverityHigh
CVSS7.3
Exploit probability—
Product
Redhat Build Of Keycloak
PublishedApr 2, 2026
First seenApr 2, 2026
Weakness typeCWE-601Open redirect
How to fix
Update
- org.keycloak:keycloak-services26.5.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat build_of_keycloak | No range specified, 26.2, 26.2.15, 26.4, 26.4.11 | — |
| org.keycloak:keycloak-servicesMaven | v < 26.5.7 | 26.5.7 |
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