CVE-2020-11055: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

May 7, 2020 (updated January 8, 2021)

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.

References

jvn.jp/en/jp/JVN41035278/index.html
bookstackapp.com/blog/beta-release-v0-29-2/
github.com/BookStackApp/BookStack/releases/tag/v0.29.2
github.com/BookStackApp/BookStack/security/advisories/GHSA-5vf7-q87h-pg6w
github.com/advisories/GHSA-5vf7-q87h-pg6w
nvd.nist.gov/vuln/detail/CVE-2020-11055

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