8.8

CVE-2023-36556: fortinet fortimail Incorrect Authorization

Modified
Published 10-10-2023Last modified 16-12-2025

Vulnerability summary

CVE-2023-36556 is a high (CVSS 8.8) Incorrect Authorization vulnerability in fortinet fortimail. EPSS estimates a 1.09% chance of exploitation in the next 30 days, higher than 65.1% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
1.09%
0%100%
Low · +0.25 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 10-10-2023
    PublishedVulnerability first disclosed.
  2. 16-12-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

1.09%

Chance of exploitation in the next 30 days

Percentile

65%

Versus all other CVEs

30-day change

Increase +0.25 pp

From 0.84% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fortinet1 product
  • fortimail≥ 7.2.0, ≤ 7.2.2 | ≥ 6.0.0, ≤ 6.0.12 | ≥ 6.2.0, ≤ 6.2.9 | ≥ 6.4.0, ≤ 6.4.7 | ≥ 7.0.0, ≤ 7.0.5 | 7.2.0 | 7.2.1 | 7.2.2

1 vendor · 1 product

References

1 links