Is CVE-2026-12704 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-12704?

CVE-2026-12704 has a CVSS v3 severity of MEDIUM (6.8).

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CVE-2026-12704

Description

When SAML IdP-initiated login is enabled in Grafana Enterprise, the SAML library skips validation of the InResponseTo field on all SAML responses, including SP-initiated logins. This removes anti-replay protection, allowing an attacker who obtains a valid signed SAML assertion to replay it and gain a session as the victim user. Only instances with the allow_idp_initiated SAML setting enabled are affected; this setting is off by default and Grafana OSS is not affected.