GHSA-82V3-6227-JC8X
Vulnerability from github – Published: 2026-07-31 09:31 – Updated: 2026-07-31 09:31A 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.
{
"affected": [],
"aliases": [
"CVE-2026-18217"
],
"database_specific": {
"cwe_ids": [
"CWE-20"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-31T08:16:28Z",
"severity": "LOW"
},
"details": "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\u0027s parameters. This can cause some service providers to process the attacker\u0027s data instead of the real login information, potentially leading to a user being logged into the wrong account.",
"id": "GHSA-82v3-6227-jc8x",
"modified": "2026-07-31T09:31:18Z",
"published": "2026-07-31T09:31:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18217"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2026-18217"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508311"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:L/A:N",
"type": "CVSS_V3"
}
]
}
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