# Fortinet patches 18 FortiAuthenticator vulnerabilities

Published: 2026-11-12 · Severity: routine
Canonical: https://vorant.io/reports/8b16c723-d5df-5ef5-9a4e-e0db4cd3b508/fortinet-patches-18-fortiauthenticator-vulnerabilities
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> NCSC-NL advisory details 18 Fortinet FortiAuthenticator flaws, several unauthenticated, enabling SQLi, LDAP injection, overflow or hardcoded-password abuse; patches available.

Source: advisories.ncsc.nl — https://advisories.ncsc.nl/2026/ncsc-2026-0490.html

## What to check

- Applies to: The 18 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation: No exploitation in the wild and no public exploit is recorded for the CVEs named.

NCSC-NL has published an advisory covering multiple vulnerabilities patched by Fortinet in FortiAuthenticator versions 6.6.0–6.6.10 and 8.0.0–8.0.3. The flaws span a wide range of weakness classes including SQL and LDAP injection, stack-based buffer overflow, format string handling errors, hard-coded passwords, NULL pointer dereference, insufficiently protected credentials, open redirect, resource exhaustion/denial of service, out-of-bounds write, infinite loop conditions, and incorrect authorization checks. Several of these issues can reportedly be exploited without an authenticated account.

Successful exploitation could result in unauthorized access, information disclosure, remote code execution, or denial of service against FortiAuthenticator, a product used for identity and access management/FSSO authentication — making it an attractive target given its role in enterprise authentication infrastructure. CVSS scores for the 18 associated CVEs range from 6.1 up to 9.1, with multiple vulnerabilities rated above 8.0, indicating high-impact issues including the FSSO buffer overflow and incorrect-authorization flaws.

No evidence of in-the-wild exploitation is mentioned in the advisory. Fortinet has released updated versions addressing all listed vulnerabilities; defenders running affected FortiAuthenticator releases should prioritize patching given the authentication-critical role of this product and the presence of unauthenticated attack vectors.

## Mentioned in this report

- Vulnerabilities: CVE-2026-121526, CVE-2026-126237, CVE-2026-126238, CVE-2026-126239, CVE-2026-126240, CVE-2026-126241, CVE-2026-126242, CVE-2026-126243, CVE-2026-126244, CVE-2026-126245, CVE-2026-126246, CVE-2026-126247, CVE-2026-126248, CVE-2026-126249, CVE-2026-126250, CVE-2026-126251, CVE-2026-126252, CVE-2026-126257

Source reporting: https://advisories.ncsc.nl/2026/ncsc-2026-0490.html

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