Is CVE-2023-36556 being actively exploited?

CVE-2023-36556 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2023-36556?

CVE-2023-36556 has a CVSS 3.1 base score of 8.8 (HIGH).

CVE-2023-36556

HIGH · CVSS 8.8EPSS 1.1%EU EUVD

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.

Key facts

CVSS score: 8.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-863
EPSS score: 1.1% (65th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2023-40503)
Published: October 10, 2023
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2023-40503 in the EU Vulnerability Database. Last updated in EUVD on December 16, 2025.

View on the EU Vulnerability Database

Affected products

fortinet / fortimail
fortinet / fortimail
fortinet / fortimail
fortinet / fortimail

Certified products that may be affected

3 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

FortiMail 6.0 - Fortinet, Inc. - FIPS 140 3380 - historical
FortiMail-2000E/3000E - Fortinet, Inc. - FIPS 140 3363 - historical
Fortinet FortiMail 6.0 - Fortinet, Inc. - Common Criteria CCEVS-VR-10899-2019 - archived

References

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

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain