Fortinet FortiOS/FortiProxy/FortiPAM up to 7.6.4/7.4/7.2 HTTP response splitting

Summaryinfo

A vulnerability marked as critical has been reported in Fortinet FortiOS, FortiProxy and FortiPAM up to 7.6.4/7.4/7.2. Affected is an unknown function of the component HTTP Handler. Performing a manipulation results in response splitting. This vulnerability was named CVE-2025-62826. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in Fortinet FortiOS, FortiProxy and FortiPAM up to 7.6.4/7.4/7.2. This affects an unknown code of the component HTTP Handler. The manipulation with an unknown input leads to a response splitting vulnerability. CWE is classifying the issue as CWE-113. The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at fortiguard.fortinet.com. This vulnerability is uniquely identified as CVE-2025-62826 since 10/23/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/14/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS
• FortiPAM
• FortiProxy

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.6.0
• 7.6.1
• 7.6.2
• 7.6.3
• 7.6.4

License

• commercial

Website

• Vendor: https://www.fortinet.com/

CPE 2.3info

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CPE 2.2info

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