CVE-2026-12704

Medium

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.

SeverityMedium

CVSS6.8

Exploit probability—

Product

Grafana Enterprise

PublishedSep 2, 2026

First seenSep 2, 2026

Weakness typeCWE-294CWE-294

How to fix

Vendor advisories

grafana.com/security/security-advisories/cve-2026-12704

Affected products

Product	Affected versions	Fixed in
Grafana Grafana Enterprise	11.6.0 ≤ v ≤ 11.6.17, 12.2.0 ≤ v ≤ 12.2.11, 12.3.0 ≤ v ≤ 12.3.11, 12.4.0 ≤ v ≤ 12.4.10, 13.0.0 ≤ v ≤ 13.0.7, 13.1.0 ≤ v ≤ 13.1.4, 13.2.0	—

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