CVE-2026-12704
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 6.8
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
- EPSS probability
- 0.27%
- CWE
- CWE-294
- Published
- 2026-09-02
- Last modified
- 2026-09-03
Affected products
- Grafana Grafana Enterprise
- Grafana Grafana Enterprise
- Grafana Grafana Enterprise
- Grafana Grafana Enterprise
- Grafana Grafana Enterprise
- Grafana Grafana Enterprise
- Grafana Grafana Enterprise
Weakness type
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