CVE-2023-36637, CoreCVE

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MEDIUM

An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiMail version 7.2.0 through 7.2.2 and before 7.0.5 allows an authenticated attacker to inject HTML tags in FortiMail's calendar via input fields

Published Oct 10, 2023

5.4

MEDIUM

CVSS 3.1

EPSS 0.39%

Description

An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiMail version 7.2.0 through 7.2.2 and before 7.0.5 allows an authenticated attacker to inject HTML tags in FortiMail's calendar via input fields.

Affected products

Vendor Fortinet Product FortiMail Default
unaffected
- Version
  7.0.1
  Status
  affected
  Constraints
  <=7.0.5
- Version
  7.2.0
  Status
  affected
  Constraints
  <=7.2.2

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Fortinet

FortiMail

unaffected

Version	Status	Constraints
7.0.1	affected	<=7.0.5
7.2.0	affected	<=7.2.2

Remediation

Vendor solution

Please upgrade to FortiMail version 7.4.0 or above Please upgrade to FortiMail version 7.2.3 or above Please upgrade to FortiMail version 7.0.6 or above

Metrics

0.39% 0.00389

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00389

Score over time

2023–2026

EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v3
EPSS v4
EPSS v5

Table of values (7 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.39% (0.00389)	30.58th	v5 (v2026.06.15)
Jun 15, 2026	0.39% (0.00389)	30.49th	v5 (v2026.06.15)
Mar 17, 2025	0.18% (0.00175)	36.63th	v4 (v2025.03.14)
Dec 12, 2024	0.05% (0.00053)	22.85th	v3 (v2023.03.01)
Jul 10, 2024	0.04% (0.00045)	14.28th	v3 (v2023.03.01)
Oct 14, 2023	0.04% (0.00045)	12.25th	v3 (v2023.03.01)
Oct 11, 2023	0.04% (0.00043)	7.22th	v3 (v2023.03.01)