Hackers exploit SiteGuard firewall vulnerability to hijack servers
Attackers are actively targeting a severe command injection flaw in SiteGuard Server Edition, allowing them to gain root access on affected web servers.
FTMQ Tech, written by our newsroom0 views
Attackers are actively exploiting an operating system command injection vulnerability in the SiteGuard Server Edition web application firewall, BleepingComputer reported. The flaw allows hackers to execute commands with administrative root or SYSTEM privileges on compromised web servers. [1]
The security flaw is tracked as CVE-2026-106931 and targets a host-based firewall feature, according to BleepingComputer. The issue specifically resides in the software's statistics feature, which is enabled by default on installations. [1]
SiteGuard is a major Japanese security vendor that states its software protects more than 1.5 million websites, BleepingComputer reported. Data from WordPress.org shows that the product remains active on at least 500,000 sites. [1]
A web shell provides a browser-based interface that allows attackers remote access to a web server for malicious activity. Web application firewalls operate between site visitors and host servers to defend against such unauthorized traffic. [2][3]
In short
- Hackers are exploiting a command injection vulnerability tracked as CVE-2026-106931 in SiteGuard Server Edition.
- The security flaw allows attackers to run commands with root or SYSTEM administrative privileges.
- The issue exists in a statistics feature that is enabled by default on affected firewall installations.
- SiteGuard claims to protect over 1.5 million websites, with 500,000 active installations tracked on WordPress.org.
Sources
Every paragraph above points to the numbered items it rests on. Read the originals here.
- [1]Hackers exploit SiteGuard WAF flaw to run commands as adminsBleepingComputer, 16d ago (the report this story comes from)
Background
- [2]Cloudflare on Wikipedia
- [3]Web shell on Wikipedia
Our newsroom writes these reports with the help of software, from the 3 sources listed and nothing else, and checks them against those sources. Facts can still be wrong or move on; the originals are the record. Spotted a mistake? Write to daniel@monsterkong.com.
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