Browser extension penetration testing
Secure browser extensions before attackers find the gaps
Protect your browser extensions from security risks with expert-led testing that helps safeguard user data, strengthen trust, and support secure software development.
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Go beyond automated scanning
Browser extensions introduce unique security risks that traditional application testing often misses. Rhymetec’s manual penetration testing evaluates permissions, browser interactions, content scripts, message passing, storage, and external communications to identify vulnerabilities before they can be exploited.
Industry-standard processes for secure browser extensions
Each engagement follows proven browser extension security testing practices, tailored to your extension, browser, and risk profile.
Planning and preparation
Define the scope, browser targets, extension functionality, user accounts, and testing objectives. Our team works with you to ensure the assessment aligns with your environment and release goals.
Discovery
The extension is reviewed to understand its architecture, permissions, browser interactions, messaging, storage, and external communications. This phase establishes the baseline for comprehensive security testing.
Penetration attempt and exploitation
Manual and automated testing to identify vulnerabilities across extension components, browser APIs, authentication workflows, dependencies, and client-side functionality. Critical findings are communicated immediately when necessary.
Analysis and reporting
Findings are documented throughout the engagement and delivered in a comprehensive report with executive summaries, technical details, risk ratings, and actionable remediation guidance for development teams.
Security insights that support every release
- Identify browser extension vulnerabilities before attackers do
- Validate permissions, browser interactions, and extension configurations
- Protect sensitive user data and authentication workflows
- Reduce security risks across extension components
- Support compliance and secure software development initiatives
Reporting built for action
At the end of the assessment, you'll receive a complete deliverable package that helps your team prioritize remediation and move forward with confidence.
- Executive summary of findings
- Overall risk assessment
- Detailed technical findings and remediation guidance
- Evidence and reproduction steps
- Retest validation (when included)
- Executive presentation upon request
Certifications our testers hold
CHFI
OSWA
OSWE
OSCP
OSED
OSCE
OSEP
CISSP
COMPTIA
CPENT
BSCP
CHFI
OSWA
OSWE
OSCP
OSED
OSCE
OSEP
CISSP
COMPTIA
CPENT
BSCP
CHFI
OSWA
OSWE
OSCP
OSED
OSCE
OSEP
CISSP
COMPTIA
CPENT
BSCP
Have a question?
We can help.
What is browser extension penetration testing?
Browser extension penetration testing evaluates the security of browser extensions by identifying vulnerabilities in permissions, messaging, storage, browser interactions, and extension functionality before attackers can exploit them.
Which browsers do you support?
We can assess extensions built for Chromium-based browsers, Firefox, and other supported browsers. Each browser implementation is treated as a separate application during testing.
How long does a browser extension penetration test take?
Most assessments are completed within approximately one week, depending on the complexity of the extension, supported browsers, and overall testing scope.
How is browser extension testing different from web application testing?
Browser extensions introduce unique attack surfaces such as content scripts, background service workers, browser APIs, extension permissions, and message passing that require specialized security testing beyond a traditional web application assessment.
What does a browser extension penetration test include?
Our assessments evaluate permissions, manifest configuration, content scripts, service workers, message passing, storage practices, external communications, dependencies, and extension authentication workflows using industry-recognized testing methodologies.
What is browser extension penetration testing?
Browser extension penetration testing evaluates the security of browser extensions by identifying vulnerabilities in permissions, messaging, storage, browser interactions, and extension functionality before attackers can exploit them.
How is browser extension testing different from web application testing?
Browser extensions introduce unique attack surfaces such as content scripts, background service workers, browser APIs, extension permissions, and message passing that require specialized security testing beyond a traditional web application assessment.
Which browsers do you support?
We can assess extensions built for Chromium-based browsers, Firefox, and other supported browsers. Each browser implementation is treated as a separate application during testing.
What does a browser extension penetration test include?
Our assessments evaluate permissions, manifest configuration, content scripts, service workers, message passing, storage practices, external communications, dependencies, and extension authentication workflows using industry-recognized testing methodologies.
How long does a browser extension penetration test take?
Most assessments are completed within approximately one week, depending on the complexity of the extension, supported browsers, and overall testing scope.
Security with benefits
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