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CVE Vulnerabilities

CVE-2026-4636

Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

Published: Apr 02, 2026 | Modified: Jun 30, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
8.1 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Ubuntu
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-4636
CWEhttps://cwe.mitre.org/data/definitions/551.html

A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. This allows the attacker to include resource identifiers owned by other users in a policy creation request, even if the URL path specifies an attacker-owned resource. Consequently, the attacker gains unauthorized permissions to victim-owned resources, enabling them to obtain a Requesting Party Token (RPT) and access sensitive information or perform unauthorized actions.

Weakness

If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.

Affected Software

NameVendorStart VersionEnd Version
Build_of_keycloakRedhat- (including)- (including)
Build_of_keycloakRedhat26.2 (including)26.2 (including)
Build_of_keycloakRedhat26.2.15 (including)26.2.15 (including)
Build_of_keycloakRedhat26.4 (including)26.4 (including)
Build_of_keycloakRedhat26.4.11 (including)26.4.11 (including)
Red Hat build of Keycloak 26.2RedHatrhbk/keycloak-operator-bundle:26.2.15-1*
Red Hat build of Keycloak 26.2RedHatrhbk/keycloak-rhel9:26.2-18*
Red Hat build of Keycloak 26.2RedHatrhbk/keycloak-rhel9-operator:26.2-18*
Red Hat build of Keycloak 26.2.15RedHatrhbk/keycloak-rhel9*
Red Hat build of Keycloak 26.4RedHatrhbk/keycloak-operator-bundle:26.4.11-1*
Red Hat build of Keycloak 26.4RedHatrhbk/keycloak-rhel9:26.4-14*
Red Hat build of Keycloak 26.4RedHatrhbk/keycloak-rhel9-operator:26.4-14*
Red Hat build of Keycloak 26.4.11RedHatrhbk/keycloak-rhel9*

Potential Mitigations

References

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