CVE-2020-11055
6.3 · MEDIUMOverview
CVE-2020-11055 is a medium-severity vulnerability affecting bookstackapp bookstack. It was published on May 7, 2020 and has a CVSS 3.1 base score of 6.3 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
In BookStack greater than or equal to 0.18.0 and less than 0.29.2, there is an XSS vulnerability in comment creation. A user with permission to create comments could POST HTML directly to the system to be saved in a comment, which would then be executed/displayed to others users viewing the comment. Through this vulnerability custom JavaScript code could be injected and therefore ran on other user machines. This most impacts scenarios where not-trusted users are given permission to create comments. This has been fixed in 0.29.2.
Remediation
Check the references section for vendor advisories and patches from bookstackapp. Update bookstack to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| bookstackapp | bookstack | >= 0.18.0, < 0.29.2 | Affected |
References
Frequently Asked Questions
What is CVE-2020-11055?
CVE-2020-11055 is a medium-severity vulnerability affecting bookstackapp bookstack. It was published on May 7, 2020 and has a CVSS 3.1 base score of 6.3 (MEDIUM).
How severe is CVE-2020-11055?
This vulnerability has a CVSS 3.1 base score of 6.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2020-11055?
Check the references section for vendor advisories and patches from bookstackapp. Update bookstack to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2020-11055?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-11055 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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