CVE-2026-121528
Fortinet FortiOS Improper Certificate Validation Vulnerability
Description
A improper certificate validation vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2.0 through 7.2.13 may allow a remote and unauthenticated attacker to perform a Man-in-the-Middle attack on the communication channel between the SSLVPN web portal and the backend destination website.
INFO
Published Date :
Nov. 11, 2026, 9:31 p.m.
Last Modified :
Nov. 11, 2026, 9:31 p.m.
Remotely Exploit :
Yes !
Source :
fortinet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 6abe59d8-c742-4dff-8ce8-9b0ca1073da8 |
Solution
- Update FortiOS to a fixed version.
- Apply vendor-supplied patches promptly.
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CVE-2026-121528 vulnerability anywhere in the article.