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5.4

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

CVE-2021-3767 · published 5 years ago
Summary

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

What to do
  • Update bookstackapp bookstack to version 21.08.2 or later.
Affected software
VendorProductAffected versions
bookstackapp bookstack < 21.08.2
cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*
Original advisory text
bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.4 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published6 Sep 2021
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2021-3767 · NVD
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