# CVE-2026-126155: Fortinet FortiMail incorrect authorization

Source: https://junglewise.ai/threats/cve-2026-126155-a-incorrect-authorization-vulnerability-in-fortinet-fortimail-8  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-11. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

CVE-2026-126155 · Severity: critical · CVSS 9.1 · Published 2026-11-11

FortiMail is a secure email gateway that protects organizations from email-borne threats. An authorization flaw allows an attacker without credentials to impersonate any IBE webmail recipient and read or send their encrypted messages by sending crafted HTTP requests. This could lead to unauthorized access to sensitive corporate communications.

Technologies: [Fortinet FortiMail](https://junglewise.ai/threats/technologies/fortimail). Vendors: [Fortinet](https://junglewise.ai/threats/vendors/fortinet).

## Quick answers

**Is CVE-2026-126155 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-126155 being exploited in the wild.

**How severe is CVE-2026-126155?** Critical severity, with a CVSS score of 9.1, published 11 November 2026.

**Which products and versions are affected?** Fortinet FortiMail 8.0.0 through 8.0.1, 7.6.0 through 7.6.6, 7.4.0 through 7.4.8, 7.2 all versions.

**Is there a fix for CVE-2026-126155?** Yes: fixed in FortiMail 8.0.2 or above, 7.6.7 or above, 7.4.9 or above; 7.2 requires migration to a fixed release. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-126155 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-126155?** Check whether you run Fortinet FortiMail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in FortiMail 8.0.2 or above, 7.6.7 or above, 7.4.9 or above; 7.2 requires migration to a fixed release

## Technical details

An incorrect authorization vulnerability (CWE-863) in FortiMail's API allows unauthenticated attackers to bypass authentication and obtain a valid IBE webmail session for any recipient via crafted HTTP requests. The vulnerability affects the API component and requires no user interaction or special network positioning to exploit. An attacker gains the ability to read and send encrypted mail as any IBE recipient.

## Affected products

- Fortinet FortiMail 8.0.0 through 8.0.1, 7.6.0 through 7.6.6, 7.4.0 through 7.4.8, 7.2 all versions

## Timeline

- 2026-11-10: disclosed
- 2026-10-05: patched: FortiMail Cloud updated to v7.6.7 GA or v8.0.2 GA

## References

- [https://fortiguard.fortinet.com/psirt/FG-IR-26-207](https://fortiguard.fortinet.com/psirt/FG-IR-26-207)

## Related threats

- [Fortinet FortiMail SQL injection](https://junglewise.ai/threats/cve-2026-126263-a-improper-neutralization-of-special-elements-used-in-an-sql)
- [Fortinet FortiMail argument injection in administrative interface](https://junglewise.ai/threats/cve-2026-126169-a-improper-neutralization-of-argument-delimiters-in-a-command)
- [Fortinet FortiMail argument injection in administrative interface](https://junglewise.ai/threats/cve-2026-126168-a-improper-neutralization-of-argument-delimiters-in-a-command)
- [Fortinet FortiMail command injection in admin GUI](https://junglewise.ai/threats/cve-2026-126167-a-improper-neutralization-of-special-elements-used-in-a-command)
- [Fortinet FortiMail argument injection in admin interface](https://junglewise.ai/threats/cve-2026-126166-a-improper-neutralization-of-argument-delimiters-in-a-command)