Open Redirect in Red Hat Build Of Keycloak
CVE-2026-7504
A flaw was found in Keycloak's URL validation logic during redirect operations. By crafting a malicious request, an attacker could bypass validation to redirect users to unauthorized URLs, potentially leading to the exposure of sensitive information within the domain or facilitating further attacks. This vulnerability specifically affects Keycloak clients configured with a wildcard (*) in the "Valid Redirect URIs" field and requires user interaction to be successfully exploited. The issue stems from a discrepancy in how Keycloak and the underlying Java URI implementation handle the user-info component of a URL. If a malicious redirect URL is constructed using multiple @ characters in the user-info section, Java's URI parser fails to extract the user-info, leaving only the raw authority field. Consequently, Keycloak's validation check fails to detect the malformed user-info, falls back to a wildcard comparison, and incorrectly permits the malicious redirect.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: -0.000
Affected products
- Red Hat Build Of Keycloak
- Red Hat Build Of Keycloak 26.2 — versions 26.2.16-1, 26.2-21
- Red Hat Build Of Keycloak 26.2.16
- Red Hat Build Of Keycloak 26.4 — versions 26.4.12-1, 26.4-17
- Red Hat Build Of Keycloak 26.4.12
- Red Hat Build Of Keycloak
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-7504 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:19594 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:19597 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:19595 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:19596 (vendor-advisory, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-7504?
- CVE-2026-7504 is a high-severity vulnerability in Red Hat Build Of Keycloak, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 8.1/10. Published 2026-05-19.
- How severe is CVE-2026-7504?
- High severity. CVSS v3 base score is 8.1 out of 10.