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Fencer Vulns
high 8.1

CVE-2026-1529 json

Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation token validation

published 2026-02-09 8 mo ago modified 2026-07-15 3 mo ago also GHSA-hcvw-475w-8g7p , EUVD-2026-6891

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.keycloak:keycloak-services 26.2.13, 26.4.9, 26.5.3
  • Red Hat Red Hat build of Keycloak 26.2 26.2-15, 26.2.13-1
  • Red Hat Red Hat build of Keycloak 26.4 26.4-10, 26.4-11, 26.4.9-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-1529 updated cvss 8.1

org.keycloak.services.resources.organizations: Keycloak: Unauthorized organization registration via improper invitation token validation

  • Red Hat build of Keycloak 26.2 rhbk/keycloak-rhel9 26.2-15, rhbk/keycloak-rhel9-operator 26.2-15, rhbk/keycloak-operator-bundle 26.2.13-1
    fixed: vendor fix RHSA-2026:2364
  • Red Hat build of Keycloak 26.2.13
    fixed: vendor fix RHSA-2026:2363
  • Red Hat build of Keycloak 26.4 rhbk/keycloak-rhel9 26.4-11, rhbk/keycloak-rhel9-operator 26.4-10, rhbk/keycloak-operator-bundle 26.4.9-1
    fixed: vendor fix RHSA-2026:2366
  • Red Hat build of Keycloak 26.4.9
    fixed: vendor fix RHSA-2026:2365

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CISA ADP 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-services
>=26.5.0, <26.5.3
<26.2.13
>=26.3.0, <26.4.9
26.5.3
26.2.13
26.4.9

Affected products

  • Red Hat Red Hat build of Keycloak 26.2
  • Red Hat Red Hat build of Keycloak 26.2.13
  • Red Hat Red Hat build of Keycloak 26.4
  • Red Hat Red Hat build of Keycloak 26.4.9

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.