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.

CVSS v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://grafana.com/security/security-advisories/cve-2026-12704

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-02 16:17

Updated : 2026-09-03 16:37

NVD link : CVE-2026-12704

Mitre link : CVE-2026-12704

CVE.ORG link : CVE-2026-12704

JSON object : View

Products Affected

No product.

CWE

CWE-294

Authentication Bypass by Capture-replay

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