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CVE-2026-126157VulnerabilityPublished

Fortinet FortiMail · Improper Authentication Vulnerability

Source GCVE Database

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Authoritative record:CVE-2026-126157· Critical 9.1

Public exploit available · CVSS 9.1 Critical · patch available : patch FortiMail as a priority.

Data as of 12 Nov 2026, 01:33 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (fortinet)CVSS 3.19.1
Patch
Available
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    CVSS exploit maturity: proof of concept public

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
FortinetFortiMailAffected
  • >=8.0.0 <=8.0.1
  • >=7.6.0 <=7.6.6
  • >=7.4.0 <=7.4.8
  • >=7.2.0 <=7.2.9
  • >=7.0.0 <=7.0.9
Fixed in–

Description

A improper authentication 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 attacker to gain access to other users' secure email accounts via crafted HTTP requests.

References

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