Medium severity · published Sep 2, 2026
CVE-2026-12704
SAML assertion replay via skipped InResponseTo validation
6.8
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
Grafana · Grafana
11.6.0 through 11.6.17; 12.2.0 through 12.2.11; 12.3.0 through 12.3.11; 12.4.0 through 12.4.10; 13.0.0 through 13.0.7; 13.1.0 through 13.1.4; +1 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12704
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-12704
grafana.com
https://grafana.com/security/security-advisories/cve-2026-12704
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