How to resolve the pentest issue related to Content Security Policy Misconfiguration

Technical Q&A
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Topic summary

A penetration test identified a Content Security Policy (CSP) misconfiguration in a web application’s headers. Two critical directives are missing:

Vulnerabilities:

  • Missing object-src directive allows injection of plugins that can execute malicious JavaScript
  • Missing script-src directive leaves the application vulnerable to script injection attacks

Impact:
Attackers could exploit these gaps to perform script injection attacks, potentially leading to unauthorized actions or data theft.

Recommended fixes:

  • Set object-src to 'none'
  • Properly configure script-src to mitigate JavaScript injection risks

A screenshot showing the header configuration details is included. The issue remains unresolved with no responses yet.

Summarized with AI on November 1. AI used: claude-sonnet-4-5-20250929.
1

The application’s Content Security Policy (CSP) is misconfigured. The ‘object-src‘ directive is missing, allowing injection of plugins that can execute malicious JavaScript. The ‘script-src‘ directive is also missing, leaving the application vulnerable to script injection attacks.

Location

Web Application Header

Impact

Attackers could exploit CSP misconfiguration to perform script injection attacks, leading to unau- thorized actions or data theft.

Recommendation

Implement a strict Content Security Policy that includes the following directives:

Set ‘object-src‘ to ’none’
Properly configure ‘script-src‘ to mitigate JavaScript injection risks

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