7.4

CVE-2026-90997

Keycloak-services: keycloak: replay protection bypass leads to unauthorized access via database driver semantics mismatch

Replay protection bypass leads to unauthorized access via database driver semantics mismatch

A flaw was found in Keycloak. When deployed in stateless mode with MySQL or MariaDB, a mismatch in row-count semantics between the database driver and Keycloak's application logic allows an attacker to bypass replay protection. This vulnerability enables an attacker who intercepts single-use security artifacts, such as JWT client assertions, DPoP proofs, or one-time password (TOTP) codes, to replay them. Successful exploitation grants unauthorized access to the token endpoint or login flow.
Mögliche Gegenmaßnahme
Keycloak Server: Disable the stateless feature of Keycloak
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerKeycloak
≫
Produkt Keycloak
Default Statusunaffected
Version 26.7.0
Version < 26.7.4
Status affected
HerstellerRed Hat
≫
Produkt Red Hat Build of Keycloak
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat Build of Keycloak
Default Statusunaffected
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Weitere Schwachstelleninformationen
SystemKeycloak
≫
Produkt Keycloak Server
Version >= 26.7.0, < 26.7.4
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.4% 0.337
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
RedHat 7.4 2.2 5.2
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-294 Authentication Bypass by Capture-replay

A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).

https://access.redhat.com/security/cve/CVE-2026-90997
https://bugzilla.redhat.com/show_bug.cgi?id=2533141
https://github.com/keycloak/keycloak/security/advisories/GHSA-xpwp-2pcm-8xq3
Third Party Advisory