CVE-2026-9086A flaw was found in Keycloak.
Updated under an hour ago ()
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It affects redhat build_of_keycloak. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.
- CVSS
- 7.3 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
redhat build_of_keycloak redhat:build_of_keycloak | from 26.4 before 26.4.13; from 26.6 before 26.6.4 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:30049third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:30050third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:30083third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:30084third-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-9086third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2480170third-party-advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9086.jsonthird-party-advisory
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.