CVE-2026-12704 — SAML assertion replay via skipped InResponseTo validation
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.…
Published: 2026-09-02 · CVSS: 6.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7