# CVE-2026-126151: CVE-2026-126151

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

A incorrect implementation of authentication algorithm vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2 all versions may allow an unauthenticated remote attacker to gain elevation of privilege (account takeover) via a crafted request.

## Remediation

- fix: Upgrade to FortiMail version 8.0.2 or above
Upgrade to FortiMail version 7.6.7 or above
Upgrade to FortiMail version 7.4.9 or above (source: CNA: fortinet)

## Affected products and versions

- Fortinet / FortiMail: ≥ 8.0.0; ≤ 8.0.1 (affected, semver); ≥ 7.6.0; ≤ 7.6.6 (affected, semver); ≥ 7.4.0; ≤ 7.4.8 (affected, semver); ≥ 7.2.0; ≤ 7.2.9 (affected, semver). Source: CNA: fortinet

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:R; source: CNA: fortinet

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-303

## Exploit evidence

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

## References

- https://fortiguard.fortinet.com/psirt/FG-IR-26-203 (CNA: fortinet)

## Provenance

- CNA: fortinet: https://www.cve.org/CVERecord?id=CVE-2026-126151; retrieved 2026-11-11; source updated 2026-11-11

Revision: b181bb2355e6dcc6b660cfd5612abeb93ce5e16ac0c7eb49ccc5b2cd3b0b12c1

Canonical: https://y2.dev/cve/CVE-2026-126151

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- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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