CVE-2020-11055 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Reference

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

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

5.4