Vulnerability in Red Hat Build Of Keycloak 26.2
CVE-2026-1529
A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attacker to successfully self-register into an unauthorized organization, leading to unauthorized access.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% 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 26.2 — versions 26.2.13-1, 26.2-15
- Red Hat Build Of Keycloak 26.2.13
- Red Hat Build Of Keycloak 26.4 — versions 26.4.9-1, 26.4-11, 26.4-10
- Red Hat Build Of Keycloak 26.4.9
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/errata/RHSA-2026:2363 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:2364 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:2365 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:2366 (vendor-advisory)
- access.redhat.com/security/cve/CVE-2026-1529 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-1529?
- CVE-2026-1529 is a high-severity vulnerability in Red Hat Build Of Keycloak 26.2, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.1/10. Published 2026-02-09.
- How severe is CVE-2026-1529?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2026-1529 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.