Fortinet has issued critical security patches addressing a previously unknown vulnerability in FortiWeb that cybercriminals are currently leveraging in active exploitation campaigns.

The security weakness, designated as CVE-2025-58034, was discovered and disclosed by Jason McFadyen from Trend Micro's Trend Research division.

This flaw enables authenticated attackers to achieve remote code execution through an OS command injection vulnerability that requires minimal technical complexity and no victim interaction to exploit successfully.

According to Fortinet's explanation, the vulnerability stems from inadequate sanitization of special characters within OS commands (classified as CWE-78). This allows malicious actors with authentication credentials to run unauthorized commands on the affected system by sending specially constructed HTTP requests or executing manipulated CLI commands.

The cybersecurity firm confirmed in its Tuesday advisory that active exploitation of this security gap has been detected in real-world attack scenarios.

When contacted by BleepingComputer, Trend Micro revealed that its monitoring systems have registered approximately 2,000 detection instances of attacks exploiting this vulnerability.

System administrators are strongly recommended to immediately deploy the latest software updates released today for their FortiWeb appliances to mitigate the risk of successful attacks targeting this security flaw.

A newly identified zero-day vulnerability in FortiWeb web application firewalls is currently being leveraged by attackers in active campaigns.

This follows a pattern of frequent targeting of Fortinet's security products by advanced threat actors.

Exploitation involves the use of HTTP POST requests to establish administrative accounts on vulnerable, internet-facing appliances.

Federal agencies in the United States have been directed to apply patches for this flaw by a November deadline, following its addition to CISA's known exploited vulnerabilities catalog.

The recent activity echoes incidents from earlier in the year, including the exploitation of a FortiSIEM flaw shortly after public disclosure.

Historically, vulnerabilities in Fortinet infrastructure have been weaponized by state-sponsored groups for persistent network access, highlighting the critical need for timely updates across these widely deployed security platforms.

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