Medium [CVE-2026-12704] SAML assertion replay via skipped InResponseTo validation
This medium-severity Red Hat Linux advisory covers CVE-2026-12704.
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Summary
On Grafana Enterprise instances with the optional IdP-initiated SAML single sign-on enabled (allow_idp_initiated = true, disabled by default), Grafana did not fully validate the InResponseTo field of SAML responses.
An attacker who obtained a valid, signed SAML assertion for a user could replay it within its short validity window to obtain an authenticated session as that user. Red Hat severity: Moderate — CVSS 6.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N).
Weakness: CWE-294. Red Hat lists Multicluster Global Hub; Red Hat Advanced Cluster Management for Kubernetes 2; Red Hat Ceph Storage 5; Red Hat Ceph Storage 6; Red Hat Ceph Storage 7; Red Hat Ceph Storage 8; Red Hat Ceph Storage 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Upgrade to a fixed version: 11.6.0+, 12.4.11+ (12.4.x), 13.0.8+ (13.0.x), 13.1.5+ (13.1.x), or 13.2.1+ (13.2.x and newer — 13.2.0 itself is still vulnerable). Not applicable to Grafana OSS, which does not include the Enterprise SAML SSO feature.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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