What’s Vulnerable › Vulnerabilities
CVE-2021-26095
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-07-20 · updated 2026-06-17
Description
The combination of various cryptographic issues in the session management of FortiMail 6.4.0 through 6.4.4 and 6.2.0 through 6.2.6, including the encryption construction of the session cookie, may allow a remote attacker already in possession of a cookie to possibly reveal and alter or forge its content, thereby escalating privileges.
Affected products
- Fortinet FortiMail: from 6.2.0 through 6.2.6; from 6.4.0 before 6.4.5 — fixed in 6.4.5
How to fix
Upgrade to a fixed version: Fortinet FortiMail 6.4.5. Check the vendor advisory for mitigations.
References
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