CVE-2026-126156 PUBLISHED

Assigner: fortinet
Reserved: 10.11.2026 Published: 11.11.2026 Updated: 11.11.2026

A authorization bypass through user-controlled key 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 take over an arbitrary IBE recipient account via crafted HTTP requests.

Metrics

CVSS 3.1

CVSS Vector: 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
CVSS Score: 9.1

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Fortinet
Product	FortiMail
Versions	Default: unaffected affected from 8.0.0 to 8.0.1 (incl.) affected from 7.6.0 to 7.6.6 (incl.) affected from 7.4.0 to 7.4.8 (incl.) affected from 7.2.0 to 7.2.9 (incl.)

Solutions

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

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-208

Problem Types

Improper access control CWE