CVE-2020-13258: Contentful Package Reflected XSS Vulnerability
Summary
CVE-2020-13258: Cross-site scripting in Contentful. Affects contentful versions < 1.12.4. Fixed in 1.12.4. How to fix ↓
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Background
Contentful is a popular content management system (CMS) used for managing and delivering digital content across various platforms. It allows developers to create, manage, and distribute content efficiently. However, a reflected cross-site scripting (XSS) vulnerability was discovered in versions of Contentful prior to 1.12.4, which could potentially allow attackers to execute malicious scripts in the context of a user's browser.
Vulnerability Detail
The vulnerability, identified as CVE-2020-13258, arises from the improper handling of user input in the 'api' parameter of the-example-app.py. This flaw allows attackers to inject malicious scripts that can be executed in the browser of users visiting the affected application. The ramifications of this vulnerability include unauthorized access to user sessions, data theft, and the potential for further exploitation of the application. The CVSS score for this vulnerability is 6.1, indicating a moderate severity level.
How To Fix
Latest published version: 2.5.0 as of 23 Oct 2026
pip install --upgrade "contentful==2.5.0"Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
1.12.4
This is the first release that contains the fix.
pip install --upgrade "contentful==1.12.4"Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If you are unable to update the package immediately, consider validating and sanitizing user inputs to prevent the execution of malicious scripts. Implementing Content Security Policy (CSP) headers can also help mitigate the risk of XSS attacks.
Conclusion
The CVE-2020-13258 vulnerability in the Contentful package poses a significant risk due to its potential for reflected XSS attacks. It is crucial for developers using this package to update to version 1.12.4 or later to mitigate the risk. Additionally, implementing input validation and CSP can provide further protection.
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FAQ
CVE-2020-13258 is a vulnerability in the Contentful package that allows for reflected cross-site scripting (XSS) attacks.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The vulnerability can lead to unauthorized access to user sessions, data theft, and further exploitation of the application.
You can update the Contentful package by running 'pip install --upgrade contentful' in your terminal.
Vulert is a monitoring tool that uses Pipfile.lock to alert users in real-time about open-source vulnerabilities in their software.
