CVE Database · CVE-2026-18217
CVSS v3.1
3.4
EPSS
0.19%
Published
Jul 31, 2026
Modified
Aug 3, 2026
Public PoC / Exploit
All weaponized →No public PoC or exploit code indexed for this CVE.
Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.
Description
A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and access management solution. The issue occurs when Keycloak handles SAML authentication requests using the HTTP-Redirect binding. If a client is configured with a wildcard redirect URL, an attacker can craft a request that includes malicious parameters. When a user authenticates, Keycloak appends its legitimate response to the attacker's parameters. This can cause some service providers to process the attacker's data instead of the real login information, potentially leading to a user being logged into the wrong account.
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:L/A:NWeaknesses (CWE)
References (2)