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TI-2021-02699 Aliases CVE-2021-3767GHSA-6wjr-v5v8-r9w2

Cross-site Scripting (XSS) - Stored in bookstackapp/bookstack

Priority LOW 25CWE-79Published · Updated

Key facts

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

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

Summary

bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Why it matters now

EPSS 0.0058 47th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed bookstackapp/bookstack (bookstackapp): 21.08.2

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
bookstackappbookstackapp/bookstackbefore 21.08.221.08.2Patch availableCNA
  • bookstackapp/bookstack Vendorbookstackapp Affected before 21.08.2 Fixed in 21.08.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*before 21.08.2Vulnerablebookstackapp
  • cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* Versions before 21.08.2 Vulnerable ·bookstackapp

Remediation

  • Fix · CNA bookstackapp/bookstack (bookstackapp) Fixed in 21.08.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    bookstackapp/bookstack 21.08.2

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2021-02700 Cross-site Scripting (XSS) - Stored in bookstackapp/bookstackPriority LOW 25
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3767
  2. 2026-10-03 Alias added: GHSA-6wjr-v5v8-r9w2

References

Exploit 1

Patch 1

  • 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