SB2026090614 - Multiple vulnerabilities in Keycloak

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Main Vulnerability Database SB2026090614

SB2026090614 - Multiple vulnerabilities in Keycloak

Published: September 6, 2026 Updated: September 10, 2026

Security Bulletin ID SB2026090614
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 20% Low 80%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 vulnerabilities.


1) Incorrect Behavior Order: Validate Before Canonicalize (CVE-ID: CVE-2026-0707)

CWE-ID: CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to bypass authorization checks.

The vulnerability exists due to incorrect behavior order in Keycloak authorization processing when parsing and canonicalizing input. A remote user can submit crafted input to bypass authorization checks.



2) Insufficient Session Expiration (CVE-ID: CVE-2026-1190)

CWE-ID: CWE-613 - Insufficient Session Expiration

CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to extend the validity period of SAML responses.

The vulnerability exists due to missing timestamp validation in Keycloak's SAML brokering functionality when processing SAML responses containing SubjectConfirmationData. A remote attacker can delay expiration of a SAML response to extend the time it is considered valid.

User interaction is required.


3) Exposure of Sensitive System Information to an Unauthorized Control Sphere (CVE-ID: CVE-2025-5416)

CWE-ID: CWE-497 - Exposure of Sensitive System Information to an Unauthorized Control Sphere

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to disclose sensitive environment information.

The vulnerability exists due to exposure of sensitive system information in the /admin/serverinfo endpoint when handling requests to retrieve server information. A remote privileged user can access the endpoint to disclose sensitive environment information.


4) Improper Authorization (CVE-ID: CVE-2026-2733)

CWE-ID: CWE-285 - Improper Authorization

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to obtain authentication tokens for a disabled Docker registry client.

The vulnerability exists due to improper authorization in the Docker v2 authentication endpoint when processing token requests for an administratively disabled Docker registry client. A remote privileged user can use previously valid credentials to obtain authentication tokens for a disabled Docker registry client.


5) Improper handling of highly compressed data (CVE-ID: CVE-2026-2575)

CWE-ID: CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of highly compressed data in SAMLRequest decompression when processing a crafted SAMLRequest. A remote attacker can send a specially crafted SAMLRequest to cause a denial of service.


Remediation

Install update from vendor's website.

References