CVE-2020-11055

Cross-site Scripting in BookStack

MEDIUM
5.4
CVSS Score
Published: May 7, 2020 at 08:40 PM UTC
Updated: June 17, 2026 at 02:48 AM UTC
1 product affected across 1 vendorBookStack

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.8%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 0.29.20.18.0 ≤ v < 0.29.2
Affected range stops below 0.29.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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