CVE-2025-62826
LowCVSS 3.1Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
An HTTP Response Splitting vulnerability in FortiOS and FortiProxy allows an attacker to inject arbitrary HTTP headers via crafted captive portal authentication requests. Affected versions include FortiOS 7.6.0-7.6.4, 7.4.x, 7.2.x and FortiProxy 7.6.0-7.6.4, 7.4.x, 7.2.x.
Risk Assessment
An attacker who can intercept and modify a user's captive portal authentication request may redirect users, steal sessions, or conduct phishing attacks within the network.
Recommendation
Immediately upgrade FortiOS and FortiProxy to a patched version (e.g., 7.6.5 or later) and implement HTTP header filtering on intermediary devices.
Original NVD description (English source)
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.