CVE-2020-26211
7.7 · HIGHOverview
CVE-2020-26211 is a high-severity vulnerability affecting bookstackapp bookstack. It was published on November 3, 2020 and has a CVSS 3.1 base score of 7.7 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
In BookStack before version 0.30.4, a user with permissions to edit a page could insert JavaScript code through the use of `javascript:` URIs within a link or form which would run, within the context of the current page, when clicked or submitted. Additionally, a user with permissions to edit a page could insert a particular meta tag which could be used to silently redirect users to a alternative location upon visit of a page. Dangerous content may remain in the database but will be removed before being displayed on a page. If you think this could have been exploited the linked advisory provides a SQL query to test. As a workaround without upgrading, page edit permissions could be limited to only those that are trusted until you can upgrade although this will not address existing exploitation of this vulnerability. The issue is fixed in BookStack version 0.30.4.
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, < 0.30.4 | Affected |
References
Frequently Asked Questions
What is CVE-2020-26211?
CVE-2020-26211 is a high-severity vulnerability affecting bookstackapp bookstack. It was published on November 3, 2020 and has a CVSS 3.1 base score of 7.7 (HIGH).
How severe is CVE-2020-26211?
This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2020-26211?
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-2020-26211?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-26211 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.
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