CVE-2026-1529
HIGHOrg.keycloak Keycloak-services - Signature Verification Bypass
Title source: ruleDescription
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.
Exploits (3)
nomisec
WORKING POC
3 stars
by ninjazan420 · poc
https://github.com/ninjazan420/CVE-2026-1529-PoC-keycloak-unauthorized-registration-via-improper-invitation-token-validation
nomisec
WORKING POC
by ackemed · poc
https://github.com/ackemed/CVE-2026-1529-PoC-keycloak-unauthorized-registration-via-improper-invitation-token-validation
References (6)
Scores
CVSS v3
8.1
EPSS
0.0001
EPSS Percentile
1.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Details
CWE
CWE-347
Status
published
Products (8)
org.keycloak/keycloak-services
26.5.0 - 26.5.3Maven
Red Hat/Red Hat build of Keycloak 26.2
26.2.13-1
Red Hat/Red Hat build of Keycloak 26.2
26.2-15
Red Hat/Red Hat build of Keycloak 26.2.13
Red Hat/Red Hat build of Keycloak 26.4
26.4-10
Red Hat/Red Hat build of Keycloak 26.4
26.4-11
Red Hat/Red Hat build of Keycloak 26.4
26.4.9-1
Red Hat/Red Hat build of Keycloak 26.4.9
Published
Feb 09, 2026
Tracked Since
Feb 18, 2026