CVE-2023-36556

Name: CVE-2023-36556
Creator: NVD / NIST
Published: 2023-10-10T17:15:12.14+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.84%

Last modified Jun 17, 2026

CVE-2023-36556 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An incorrect authorization vulnerability [CWE-863] in FortiMail webmail version 7.2.0 through 7.2.2, version 7.0.0 through 7.0.5 and below 6.4.7 allows an authenticated attacker to login on other users accounts from the same web domain via crafted HTTP or HTTPs requests.. EPSS estimates a 0.84% chance of exploitation in the next 30 days.

Description

An incorrect authorization vulnerability [CWE-863] in FortiMail webmail version 7.2.0 through 7.2.2, version 7.0.0 through 7.0.5 and below 6.4.7 allows an authenticated attacker to login on other users accounts from the same web domain via crafted HTTP or HTTPs requests.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.84%

53.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Fortinet	Fortimail	>= 6.0.0, <= 6.0.12
Fortinet	Fortimail	>= 6.2.0, <= 6.2.9
Fortinet	Fortimail	>= 6.4.0, <= 6.4.7
Fortinet	Fortimail	>= 7.0.0, <= 7.0.5
Fortinet	Fortimail	7.2.0
Fortinet	Fortimail	7.2.1
Fortinet	Fortimail	7.2.2

References

https://fortiguard.com/psirt/FG-IR-23-202Vendor Advisory
https://fortiguard.com/psirt/FG-IR-23-202Vendor Advisory

Timeline

Published: Oct 10, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-36556?

How severe is CVE-2023-36556?

CVE-2023-36556 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.

How do I fix CVE-2023-36556?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-36556?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST