BookStack vulnerable to cross-site scripting


BookStack contains a cross-site scripting vulnerability (CWE-79).

Kenichi Okuno of Mitsui Bussan Secure Directions, Inc reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 5.4 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 3.5 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: Single Instance
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

BookStack project
  • BookStack versions prior to v0.29.2


An arbitrary script may be executed on the user's web browser.

[Update the Software]
Update the software to the latest version according to the information provided by the developer.

The developer states as follows;
After upgrading, The command php artisan bookstack:regenerate-comment-content should be ran to remove any pre-existing dangerous content.
Vendor Information

BookStack project
CWE (What is CWE?)

  1. Cross-site Scripting(CWE-79) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2020-11055

  1. JVN : JVN#41035278
  2. National Vulnerability Database (NVD) : CVE-2020-11055
Revision History

  • [2020/05/13]
      Web page was published