Dangerous file upload in BookStack - #VU57966

Vulnerability identifier: #VU57966

CSH Severity: Medium

CVSS v4: 2.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: N/A

CWE-ID: CWE-434

Exploitation vector: Remote access

Exploit availability: No public exploit available

The disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data when processing HTML attachments. A remote attacker can upload an HTML file to the server and perform phishing attacks.

BookStack

Install updates from vendor's website.

BookStack - update to 21.10.3

• https://github.com/BookStackApp/BookStack/releases/tag/v21.10.3

• Multiple vulnerabilities in BookStack