Low3.1Fortinet
Header injection in captive portal authentication form
FG-IR-26-153 Published Jul 14, 2026Updated by vendor Jul 14, 2026
Affected products & platforms
FortinetFortiGateFirewallFortiOSFortiProxy
Summary
CVSSv3 Score: 3.1 An Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulnerability [CWE-113] in FortiOS and FortiProxy captive portal may allow an attacker able to intercept and modify a user's authentication request to inject arbitrary headers via crafted HTTP requests. Revised on 2026-07-14 00:00:00
Affected versions
- FortiOS 7.6: 7.6.0 through 7.6.4
- FortiOS 7.4: 7.4 all versions
- FortiOS 7.2: 7.2 all versions
- FortiProxy 7.6: 7.6.0 through 7.6.4
- FortiProxy 7.4: 7.4 all versions
- FortiProxy 7.2: 7.2 all versions
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
- FortiOS 7.6: 7.6.5
- FortiOS 7.4: migrate to a fixed release
- FortiOS 7.2: migrate to a fixed release
- FortiProxy 7.6: 7.6.5
- FortiProxy 7.4: migrate to a fixed release
- FortiProxy 7.2: migrate to a fixed release
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Upgrade per the Affected/Solution table: FortiOS 7.6: 7.6.5; FortiOS 7.4: migrate to a fixed release; FortiOS 7.2: migrate to a fixed release; FortiProxy 7.6: 7.6.5; FortiProxy 7.4: migrate to a fixed release; ….
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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