Fast Facts
- Two PHP vulnerabilities enable unauthenticated remote code execution and potential system takeover.
- Unpatched PHP websites—including WordPress sites—may be exposed to these attacks.
- PHP’s broad use (about 75% of identifiable websites) makes the flaws’ potential impact widespread.
Threat, Techniques, and Targets
The PHP vulnerability could let attackers run arbitrary code remotely or take control of systems without logging in or authenticating. PHP developers released fixed versions on October 21.
The vulnerability affects organizations that use PHP. W3Techs estimates that about 75% of websites with an identified programming language use PHP. WordPress, which runs on PHP, powers about 43% of all websites. In response, South Korea’s MSIT and KISA notified companies in the C-TAS information-sharing system and organizations required to appoint a CISO.
Impact, Security Implications, and Remediation
Because PHP supports many websites, the vulnerability creates broad security risk. However, small and medium-sized businesses may struggle to install patches promptly if they lack dedicated security staff.
PHP developers released updates that fix the two vulnerabilities. Therefore, organizations should apply the relevant updates and follow KISA’s security notice. MSIT is reviewing emergency patch support for small and medium-sized businesses. For system-specific instructions, organizations should consult the relevant vendor or authority.
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