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Advisory details: vulnrichment / CVE-2026-1529
Advisory ID vulnrichment/CVE-2026-1529
Aliases
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.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-347 Improper Verification of Cryptographic Signature
System Score Found at
cvssv3.1 8.1
ssvc Track
Reference id Reference type URL
https://bugzilla.redhat.com/show_bug.cgi?id=2433783
cpe:/a:redhat:build_keycloak:26.2::el9 Other https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:build_keycloak:26.2::el9
cpe:/a:redhat:build_keycloak:26.4::el9 Other https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:build_keycloak:26.4::el9
CVE-2026-1529 https://access.redhat.com/security/cve/CVE-2026-1529
RHSA-2026:2363 https://access.redhat.com/errata/RHSA-2026:2363
RHSA-2026:2364 https://access.redhat.com/errata/RHSA-2026:2364
RHSA-2026:2365 https://access.redhat.com/errata/RHSA-2026:2365
RHSA-2026:2366 https://access.redhat.com/errata/RHSA-2026:2366
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Found at None
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-09T20:51:02Z/ Found at None

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-09T20:51:02Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/1xxx/CVE-2026-1529.json

Source Advisory: vulnrichment/CVE-2026-1529

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]