What’s Vulnerable › Vulnerabilities

CVE-2025-62826

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-14 · updated 2026-09-29
• Weakness: CWE-113

Description

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 (FortiGate): 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

How to fix

Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 7.6.5; Fortinet FortiProxy 7.6.5. Check the vendor advisory for mitigations.

References

• https://fortiguard.fortinet.com/psirt/FG-IR-26-153
• https://cert-portal.siemens.com/productcert/html/ssa-864900.html

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