# CVE-2026-126240: CVE-2026-126240

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

A improper neutralization of special elements used in an ldap query ('ldap injection') vulnerability in Fortinet FortiAuthenticator 8.0.0 through 8.0.3, FortiAuthenticator 6.6.0 through 6.6.10 may allow an authenticated attacker to bypass authentication. Successful exploitation requires either a malicious/compromised upstream IdP, or an IdP configuration that allows the user to control the NameID (or the SAML attribute used as the username).

## Remediation

- fix: Upgrade to FortiAuthenticator version 8.0.4 or above
Upgrade to FortiAuthenticator version 6.6.11 or above (source: CNA: fortinet)

## Affected products and versions

- Fortinet / FortiAuthenticator: ≥ 8.0.0; ≤ 8.0.3 (affected, semver); ≥ 6.6.0; ≤ 6.6.10 (affected, semver). Source: CNA: fortinet

## Severity and prioritization

- CVSS 3.1: 8.2 (high); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N/E:P/RL:O/RC:C; source: CNA: fortinet

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-90

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://fortiguard.fortinet.com/psirt/FG-IR-26-255 (CNA: fortinet)

## Provenance

- CNA: fortinet: https://www.cve.org/CVERecord?id=CVE-2026-126240; retrieved 2026-11-11; source updated 2026-11-11

Revision: d8caa8a14c2a9152e474df14f0d479de6476aaeb88f19aa2276e94a5bdaf0b69

Canonical: https://y2.dev/cve/CVE-2026-126240

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