CVE-2026-3872Keycloak: keycloak: information disclosure due to redirect_uri validation bypass
Updated under an hour ago ()
Does this affect you?
It affects Red Hat build of Keycloak 26.2 and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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
- 7.3 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-601
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Jul 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat build of Keycloak 26.2 redhat:build_keycloak | from 26.2.15-1 not affected | CNA record |
Red Hat Red Hat build of Keycloak 26.2 redhat:build_keycloak | from 26.2.15-1 not affected | CISA ADP |
redhat build_of_keycloak redhat:build_of_keycloak | all versions; 26.2; 26.2.15; 26.4; 26.4.11 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:6475vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:6476vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:6477vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:6478vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-3872vdb-entry, x-refsource-redhat, vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2445988issue-tracking, x-refsource-redhat, vendor-advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3872.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.