CVE-2026-1529

HIGH

Org.keycloak Keycloak-services - Signature Verification Bypass

Title source: rule

Description

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 1 stars
by 0x240x23elu · poc
https://github.com/0x240x23elu/CVE-2026-1529
nomisec WORKING POC
by ackemed · poc
https://github.com/ackemed/CVE-2026-1529-PoC-keycloak-unauthorized-registration-via-improper-invitation-token-validation

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