CVE-2021-26095 Weak cryptography in Fortinet FortiMail

What is CVE-2021-26095?

CVE-2021-26095 is a high-severity vulnerability in Fortinet FortiMail, published on 20 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Which versions are affected by CVE-2021-26095?

It affects 1 product.

Products include Fortinet Fortimail.

How do I fix CVE-2021-26095?

No fix has been published for CVE-2021-26095 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-26095 being exploited?

There is no known exploitation of CVE-2021-26095 in the wild and no public exploit code.

Other vulnerabilities in Fortinet FortiMail

• CVE-2026-104286 Fortinet FortiMail Path Traversal Exploited Critical 9.8
• CVE-2021-36166 Auth bypass in Fortinet FortiMail Critical 9.8
• CVE-2021-24007 SQL injection in Fortinet FortiMail Critical 9.8
• CVE-2020-9294 Auth bypass in FortiMail Critical 9.8
• CVE-2023-47539 Auth bypass in FortiMail Critical 9.0

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-287r-v59r-8g28.