# App Security Testing

Published articles for App Security Testing.

This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles.

## MAST in the Age of Open Source Software |Guardsquare

DevFeed: [MAST in the Age of Open Source Software |Guardsquare](<https://devfeed.tech/articles/mast-in-the-age-of-open-source-software-guardsquare-26310.md>)

Original publisher: [Read original article](<https://www.guardsquare.com/blog/open-source-software-mast>)

Author: Simon Haven - Product Marketing Manager

Published: 2026-09-01T10:59:01Z

Content type: article

Language: en

Sources: [Guardsquare Blog](<https://devfeed.tech/sources/guardsquare-blog.md>)

Topics: [Open Source](<https://devfeed.tech/topics/open-source.md>), [Mobile Security](<https://devfeed.tech/topics/mobile-security.md>), [Application Security](<https://devfeed.tech/topics/application-security.md>), [Vulnerabilities](<https://devfeed.tech/topics/vulnerabilities.md>), [Social engineering](<https://devfeed.tech/topics/social-engineering.md>), [npm](<https://devfeed.tech/topics/npm.md>)

Tags: [app-security-testing](<https://devfeed.tech/tags/app-security-testing.md>), [application-security](<https://devfeed.tech/tags/application-security.md>), [appsweep](<https://devfeed.tech/tags/appsweep.md>), [general](<https://devfeed.tech/tags/general.md>), [malware](<https://devfeed.tech/tags/malware.md>), [mobile](<https://devfeed.tech/tags/mobile.md>), [mobile-apps](<https://devfeed.tech/tags/mobile-apps.md>), [npm](<https://devfeed.tech/tags/npm.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [open-source-software](<https://devfeed.tech/tags/open-source-software.md>), [social-engineering](<https://devfeed.tech/tags/social-engineering.md>), [supply-chain](<https://devfeed.tech/tags/supply-chain.md>), [vulnerabilities](<https://devfeed.tech/tags/vulnerabilities.md>)

### AI overview

This article explains why mobile application security testing is important when apps use free and open source software. It describes how vulnerable, deprecated, compromised, and transitive third-party dependencies can expand an app's attack surface, citing a September 2025 npm supply chain attack as an example.

### Source excerpt

Building with free and open source software (FOSS) has become common practice for app developers. In 2022, it was estimated that between 70% and 90% of any given software codebase was made up of open source components. Leveraging open source projects presents many advantages: