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TI-2020-08929 Aliases CVE-2020-11055GHSA-5vf7-q87h-pg6w

Cross-site Scripting in BookStack

Priority LOW 29CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

EPSS 0.00782 56th percentileScored 2026-11-07
Fix Fixed BookStack (BookStackApp): 0.29.2ssddanbrown/bookstack (Packagist): 0.29.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
bookstackappBookStack0.18.0 to before 0.29.20.29.2Patch availableCNA
—ssddanbrown/bookstack (Packagist)0.18.0 to before 0.29.20.29.2Patch availableGHSA-5vf7-q87h-pg6w
  • BookStack Vendorbookstackapp Affected 0.18.0 to before 0.29.2 Fixed in 0.29.2 Patch available CNA
  • ssddanbrown/bookstack (Packagist) Vendor— Affected 0.18.0 to before 0.29.2 Fixed in 0.29.2 Patch available GHSA-5vf7-q87h-pg6w

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*0.18.0 to before 0.29.2Vulnerablebookstackapp
  • cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* Versions 0.18.0 to before 0.29.2 Vulnerable ·bookstackapp

Remediation

  • Fix · CNA BookStack (BookStackApp) Fixed in 0.29.2
  • Fix · GHSA-5vf7-q87h-pg6w ssddanbrown/bookstack (Packagist) Fixed in 0.29.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-11055
  2. 2026-10-03 Alias added: GHSA-5vf7-q87h-pg6w

References

Advisory 4

Other 2

  • TI-2021-02995 Improper Access Control in bookstackapp/bookstack CVSS 3.1CRITICAL 9.8
  • TI-2023-04263 Server-Side Request Forgery (SSRF) in bookstackapp/bookstack CVSS 3.1LOW 2.4
  • TI-2020-04312 Remote Code Execution Through Image Uploads in BookStack CVSS 3.1HIGH 8.8
  • TI-2020-16032 Cross-Site Scripting in BookStack CVSS 3.1HIGH 8.7
  • TI-2020-16031 Cross-Site Scripting in BookStack CVSS 3.1HIGH 8.7
  • TI-2023-05693 Book Stack v23.10.2 - LFR via Blind SSRF CVSS 3.1MEDIUM 6.5
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences