SAML assertion replay via skipped InResponseTo validation (CVE-2026-12704) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-12704

SAML assertion replay via skipped InResponseTo validation

Answer in brief

CVE-2026-12704 records a Unknown severity vulnerability in SAML assertion replay via skipped InResponseTo validation. The current sources do not mark it as known exploited. The current feed maps Grafana/Grafana Enterprise (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 2, 2026Updated Sep 3, 2026Source checked Sep 3, 2026First seen by HOL Sep 2, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Grafana/Grafana Enterprise (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Grafana/Grafana Enterprisegeneric	11.6.0 \|\| 12.2.0 \|\| 12.3.0 \|\| 12.4.0 \|\| 13.0.0 \|\| 13.1.0 \|\| 13.2.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Grafana/Grafana Enterprise.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 2, 2026

Sources and claim methodology

Source referencegrafana.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.