CVE-2020-11055

Cross-site Scripting in BookStack

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.

Category

6.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.39%
Vendor Advisory bookstackapp.com
Affected: BookStackApp BookStack
Published at:
Updated at:

References

Link Tags
https://github.com/BookStackApp/BookStack/security/advisories/GHSA-5vf7-q87h-pg6w third party advisory
https://bookstackapp.com/blog/beta-release-v0-29-2/ release notes vendor advisory
https://github.com/BookStackApp/BookStack/releases/tag/v0.29.2 release notes
http://jvn.jp/en/jp/JVN41035278/index.html third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-11055?
CVE-2020-11055 has been scored as a medium severity vulnerability.
How to fix CVE-2020-11055?
To fix CVE-2020-11055, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-11055 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-11055 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-11055?
CVE-2020-11055 affects BookStackApp BookStack.
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