Authentication Bypass by Capture-replay in Grafana Enterprise - CVE-2026-12704
Published: September 4, 2026
Vulnerability identifier: #VU146960
CSH Severity: Medium
CVSS v4: 7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-12704
CWE-ID: CWE-294
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain a session as the victim user.
The vulnerability exists due to improper validation of the InResponseTo field in the SAML library when processing SAML responses. A remote attacker can replay a valid signed SAML assertion to gain a session as the victim user.
User interaction is required, and only instances with the allow_idp_initiated SAML setting enabled are affected.
Affected software
Grafana Enterprise
How to mitigate CVE-2026-12704
Install security update from vendor's website.
Grafana Enterprise - addressed in versions 12.4.11, 13.0.8, 13.1.5, 13.2.1