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CVE-2026-93998

Red Hat build of Keycloak 26.4 · Vulnerability

CVSS 3.1 7.4 HIGHCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-93998

Published

A flaw was found in the SAML adapter component of Keycloak, which is used to secure applications with SAML-based authentication. The adapter fails to verify that the issuer of a signed SAML assertion matches the expected identity provider configured for the application. If multiple identity providers share the same trusted signing key, an attacker who controls one of those providers can create a validly signed assertion to log into the application as any user, potentially gaining full administrative control.

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Affected versions, risk and source history

Exploitation and risk

Source status

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cve-program · CVE-2026-93998

Published

Keycloak-core: keycloak-core: saml adapter does not bind signed assertions to the configured identity provider issuer

A flaw was found in the SAML adapter component of Keycloak, which is used to secure applications with SAML-based authentication. The adapter fails to verify that the issuer of a signed SAML assertion matches the expected identity provider configured for the application. If multiple identity providers share the same trusted signing key, an attacker who controls one of those providers can create a validly signed assertion to log into the application as any user, potentially gaining full administrative control.

Source published
5 Nov 2026 17:15:33 UTC
Source modified
6 Nov 2026 19:44:41 UTC
Saved here
6 Nov 2026 21:03:03 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

ChangeIntel

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Sources read 15 Nov 03:49 UTC · 252 of 275 readable · 247 fully read · documentation 469/469 current

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