6 Tips to check your PWA security from threats

by Flora

PWA security is a big issue that many people are concerned about. It’s because PWA is growing more popular as a result of its benefits, particularly in the business sector.  The problem is that the Internet was not designed with modern security in mind. Ensuring that PWAs are both highly helpful and highly safe becomes a key issue for both developers and users. This post will give some tips for detecting PWA security risks.

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Understanding PWA Security 

What is Progressive Web App (PWA)?

Progressive Web Application (PWA) is a perfect combination of web and application, allowing web-based applications to have the same features as native applications. In a nutshell, Progressive Web App is a means to improve web apps by delivering amazing ideas to improve user experience, something that standard web apps cannot accomplish.

A Progressive Web App is a web-visible user experience with three characteristics:

  • High reliability and quality: even in uncertain network conditions, users can load programs promptly and never see any error messages.
  • Fast: quick user interaction reaction time with fluid visuals and quality scrollbars.
  • Attractive: users have the impression that they are using a natural application on the device, which is realistic and vivid.pwa-characteristics

Knowledge about PWA Security

The PWA layout is responsively developed, with a smooth navigation bar that provides consumers with a better experience while browsing the site on mobile devices rather than laptops. In terms of design, PWA improves customer security, plays a key role in transactions, and facilitates data sharing.


However, no system, including PWA security, can guarantee 100 % security. For bad actors, new technologies open up new avenues of attack. Progressive Web Apps may appear to be new technology because they are utilized to generate native-like mobile app experiences, but they are mostly enriched web applications. As a result, PWAs may be vulnerable to all known types of online attacks.


How is PWA security damaged?

Cookies are small data files generated by a web server and sent to a web browser or PWA. If attackers obtain post-multifactor authentication cookies, they may be able to bypass subsequent attempts and gain full access to enterprise networks. Cookie hijacking, also known as session hijacking, comes into play here. If hackers successfully hijack ongoing sessions, they may be able to acquire critical session details — or cookies — which they can then use to disguise themselves as authorized users and carry out certain actions.

When users do not explicitly log out of browser sessions and instead close the progressive web application that they are using, the sessions do not expire immediately. In most cases, servers specify a time to close, allowing attackers to sneak in, collect cookies, and munch their way through any linked services until they’ve fulfilled their goals or the session times out. This is how hackers circumvent PWA security using cookies.

6 tips to check your PWA security from threats

Even though there are still security vulnerabilities, there are six ways to test and improve PWA security:

Tip 1: Always make use of HTTPS

A secure network must be used to provide the web application. Being a secure site is not only a recommended practice; it also identifies your online application as a trustworthy site, which is especially important when users need to make secure transactions. Most PWA capabilities, such as geolocation or even Service Workers, are only available after the app has been loaded over HTTPS.

By default, Progressive Web Apps must be provided from SSL-certified servers through the HTTPS protocol. It is the only method to make the Service Workers work, and we can only be sure that the data transferred back and forth between the browser and the APIs are safely protected via HTTPS. This is especially significant because the customer’s / user’s tokens are passed through HTTP Headers or response parameters.


When PWA data is transmitted over HTTPS, it is encrypted. HTTPS is an abbreviation for HyperText Transfer Protocol Secure, which is a secure form of HTTP, the protocol used to send data between your browser and the website you’re visiting. The ‘S’ at the end of HTTPS denotes “Secure.” This implies that all data exchanged between the browser and the webserver is encrypted. HTTPS is often used to ensure highly secure online transactions such as banking and shopping. HTTPS is implemented to ensure PWA security, eliminating scenarios where data can be readily hacked or stolen.

Tip 2: Using Service Workers

A service worker would be a script that allows you to intercept and manage how your web browser handles network requests or asset caching. Online developers can use Service Workers to generate consistently speedy web pages & offline experiences.

In other words, the Service Worker is a background process that is independent of the browser’s main thread and performs resource caching as well as providing several useful APIs for PWA. This enables the website to do some activities even while you are not using it.

Service workers provide PWAs with native-app-like functionality. To understand how Service Workers work, imagine them as the intermediary between an application’s frontend and backend. Service workers enable developers to include native-like functionalities in their apps, such as:

  • Notifications through push
  • Caching (for offline use)
  • Background synchronization


Source: mobile legends

The PWA can then do the same background functionality as the Native App, such as push notifications or syncing new data, downloading files, using real-time location, and so on. That means it’ll be the one who stands out. When there is a network, PWA will download data from the server; when there isn’t a network, it will take cached data and provide it to PWA.


Service workers are still only registered in HTTPS encrypted browsers to prevent tampering and include extra PWA security safeguards to restrict the impact of malicious server workers, as stated below:

  • Because Service Workers are Javascript workers, they do not have direct access to the DOM or cookies. Rather, they use the postMessage protocol to connect with other pages.
  • Service workers can only access Cache Storage and indexedDB for caching purposes, but not Local Web Storage or Session Storage.
  • Service personnel is not permitted to read or set prohibited headers.

Tip 3: Using manifest file

In a PWA, the manifest file is located in the HTML and is responsible for the presentation and design of your app, including the name, background color, icon, and so on. When there is a manifest file present, a hostile attacker cannot override it and target the app. As a result, your PWA’s name, description, and icon are safe.

Within the PWA security risks, a manifest is a JSON file. The manifest includes all of the information required for the app to be downloaded and shown. Examples of this data include:

  • App name 
  • Home screen icon
  • App description 
  • Display options

The manifest’s ability to cause PWA security risks is limited, but it doesn’t mean you shouldn’t take PWA security carefully. Cyber attackers, for example, like to utilize cross-site scripting assaults, in which they try to inject their malicious script into a target application. Regarding the manifest, attackers will be unable to override your manifest because browsers use the first version of the manifest regardless of how many manifests are in the code.

An attacker, on the other hand, may connect their manifest if you don’t have a manifest configured for your PWA. While the PWA security risks with such an attack are confined to aesthetics such as the app icon, name, colors, and so on, it has the potential to harm your brand and drive people away from your app. Furthermore, certain web browsers adhere to new content security regulations that limit the sites from which a web manifest can be retrieved, reducing the amount of possible PWA security risks that could be done through the manifest.


Tip 4: Improving Storage Architecture 

HTML web storage is commonly used to minimize the time between request and response and increase the performance of PWAs. The issue is that HTML cookie storage simplifies the attack procedure for cookie stealers seeking to duplicate session access; online storage at scale remains vulnerable to cross-site scripting (XSS) attacks. The users propose avoiding web storage in favor of secure, local alternatives to reduce the possibility of cookie compromise.

Tip 5: Advancing RASP Solutions

Runtime application self-protection (RASP) solutions reside within the application’s runtime code. This provides them with a bird’s-eye view of every user request and function call that the software makes. While enhanced RASP options may not eliminate the possibility of cookie-jacking if attackers can listen in on user sessions, they can notice unusual application behavior caused by cookie theft and take action to stop the session, minimizing the amount of time malicious users have access.

RASP is a strong solution that intercepts all app-to-system calls and ensures their security. It checks data queries within the app. It enhances overall application security by monitoring inputs and rejecting those that potentially facilitate attacks, while also safeguarding the runtime environment from unauthorized changes and manipulation. RASP suppliers provide extraordinary insight and protection, swiftly and effectively preventing assaults until the underlying vulnerabilities are resolved.

The following are the two primary RASP capabilities:

  • Application protection entails accurately preventing application vulnerabilities from being exploited while not interfering with normal application use.
  • Application threat intelligence: Providing security teams with visibility into who is attacking, what strategies are being used, and which applications are being targeted down to the code level.advancing-RASP-Solutions-to-protect-pwa-security

Source: Appstealing

Tip 6: Extending IAM Services

Identity and access management (IAM) ensures that the right people and job responsibilities (identities) in your business have access to the tools they require to accomplish their tasks. Identity management and access systems allow your organization to manage employee apps without checking in as an administrator to each app. IA solutions allow your organization to manage a variety of identities, such as people, software, and hardware such as robotics and IoT devices.

IAM services that are comprehensive. These techniques, like multifactor authentication, are insufficient in isolation to defend applications at scale. However, when used with complementary technologies like RASP and HTTPS, IAM solutions can assist reduce total risk.

In general, identity management solutions accomplish two functions:

  • By validating the user’s, software’s, or hardware’s credentials against a database, IAM ensures that the user, software, or hardware is who they claim to be. Traditional username and password solutions are insecure and inflexible in comparison to IAM cloud identity tools.
  • Only the appropriate level of access is granted by identity access management systems. Instead of giving access to a full software suite with a username and password, IAM allows for limited slices of access to be portioned out, such as editor, viewer, and commenter in a content management system.

Companies must choose IAM services that go beyond local stacks in this case. You must include cloud-based applications and services, especially as the number of PWAs increases.


Source: Veritis

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Conclusion on PWA security

The most serious worry is PWA security. Here are a few pointers to assist you better safeguarding your PWA security. However, there is no way to be completely safe. The best approach to respond proactively if you notice any difficulties is to thoroughly grasp PWA and how it works. To begin, please go to a reputable website.

If you’re curious, you may find more about the BSS Commerce Magento PWA development service HERE!       

Moreover, read our blog for a more in-depth discussion of PWAs and their benefits. Alternatively, if you would like to hear more about how BSS Commerce can assist you in developing a safe and effective PWA. Please contact us!

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