Keycloak-services: keycloak-services: jwt authorization grant bypasses identity provider login restrictions
CVSS score
5.4
EPSS probability
—
Risk score
0.5
Published
1 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%53
Short explanation
A vulnerability exists in the JWT Authorization Grant implementation of the keycloak-services component, allowing identity provider login restrictions to be bypassed. Restrictions that apply during standard browser logins are skipped during the JWT-based grant flow. This allows authenticated clients to obtain access tokens for users who should have been blocked by identity provider claims.
This vulnerability allows identity provider policies and claim filtering mechanisms to be bypassed via JWT-based flows. It compromises authentication integrity by enabling authenticated clients to acquire access tokens on behalf of users who should otherwise be restricted.
What should be done?
- Follow the official vendor advisory for guidance and updates
- Review OIDC and Google identity provider configurations
- Audit the usage of JWT Authorization Grant flows
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
CVE-2026-117627 zafiyeti Red Hat Build of Keycloak ve Red Hat Single Sign-On 7 ürünlerini etkilemektedir.
Güvenlik açığı CVSS taban puanı 5.4 ile MEDIUM seviyesindedir.
JWT tabanlı hibe akışı sırasında kimlik sağlayıcı kısıtlamaları ve talep filtreleme kontrolleri atlanmaktadır.
Show the technical text from the sources
A flaw was found in the JWT Authorization Grant implementation of the keycloak-services component. When an OIDC or Google identity provider is configured with specific login restrictions, such as claim filtering, these checks are correctly applied during standard browser logins but are skipped during the JWT-based grant flow. This allows an authenticated client to obtain access tokens for a user even if their identity provider claims should have blocked the login.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE: CWE-862
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 5.4 | CVSS V31 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N | NVD |
| 5.4 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N | CVE CNA |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-117627 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-117627 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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