CVE-2025-62826
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
CSIRTS triage
- What
- An attacker may inject arbitrary headers via crafted HTTP requests.
- Who is affected
- Users of FortiOS and FortiProxy captive portal.
- Urgency
- Remediation is important to mitigate risks of header injection.
- Action
- Implement input validation on authentication requests.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all EPSS-scored CVEs.
Advisory coverage (4)
- low[NEW] [low] Fortinet FortiProxy and FortiOS: Multiple vulnerabilitiescert-bund · 2026-07-15
- unknownMultiple vulnerabilities in Fortinet products (July 15, 2026)cert-fr-avis · 2026-07-15
- lowCVE-2025-62826: An Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulne…nvd · 2026-07-14
- unknownHeader injection in captive portal authentication formfortinet · 2026-07-14
External references
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