Apache mod_proxy HTML Injection / Partial XSS

Sooraj V Nair
Published on
10 Jan 2022


A restricted cross-site scripting vulnerability was reported in Apache HTTP Server 2.4.0-2.4.39, affecting the mod proxy error page. An attacker might make the link on the error page faulty, causing it to redirect to a URL of their choosing. This would only be exploitable if a server was set up with proxying enabled but the Proxy Error page was displayed due to a configuration error.


  • Update Apache to the latest version

  • Correctly configure the Proxy settings

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Written by
Sooraj V Nair
Sooraj V Nair
Cyber Security Engineer
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