FORTINETVERIFIED
Header injection in captive portal authentication form
Checked 8 Oct 2026. BlackTree preserves the last verified facts if a later source check is temporarily unavailable.
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SECURITY ADVISORYFORTINETVERIFIED
PUBLISHER UPDATE · FORTINET-PRODUCTS-3917C34972D1BB3D
FORTINET-PRODUCTS-3917C34972D1BB3D release notes and known issues
Header injection in captive portal authentication form
Scope: Fortinet products. This update record adds version, fix and known-issue context. Its publication date is not a lifecycle boundary.
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
Improvements and security content
- 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
Known issues
Publisher statementNot stated. The verified publisher record does not contain a known-issues statement.
Affected products and versions
Products
- Fortinet products
Affected versions
- 3.1
Fixed versions or updates
- No fixed version is stated in this record.
Recommended action
Review the official publisher document before deployment.