CVE-2025-62826: Fortinet FortiOS

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

An Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulnerability [CWE-113] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4 all versions, FortiProxy 7.2 all versions may allow an attacker able to intercept and modify a user's captive portal authentication request to inject arbitrary headers via crafted HTTP requests.

Affected products

• Fortinet FortiOS: from 7.2.0, before 7.6.5 (fixed in 7.6.5)
• Fortinet FortiProxy: from 7.2.0, before 7.6.5 (fixed in 7.6.5)

Published 2026-07-14. Last modified 2026-09-29.