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CVE-2021-3906

6.5 MEDIUM

bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type

Published: 2021-10-27 · Last updated: 2026-06-17

Severity and scoring

CVSS
6.5 MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
CWE-434

Affected products

VendorProduct
bookstackappbookstack

Description

bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type

Source: NVD

References

Related CVEs

Same vendor

  • CVE-2021-3874 — bookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (6.5 MEDIUM)
  • CVE-2021-3768 — bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (5.4 MEDIUM)
  • CVE-2021-3767 — bookstack is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (5.4 MEDIUM)
  • CVE-2021-3758 — bookstack is vulnerable to Server-Side Request Forgery (SSRF) (6.5 MEDIUM)

Same CWE

  • CVE-2026-40750 — Unrestricted Upload of File with Dangerous Type vulnerability in themagnifico52 Kids Online Store allows Upload a Web Shell to a Web Server (9.9 CRITICAL)
  • CVE-2026-6933 — The Premmerce Dev Tools plugin for WordPress is vulnerable to Remote Code Execution via missing authorization in versions up to and inclu... (8.8 HIGH)
  • CVE-2026-40772 — Unauthenticated Arbitrary File Upload in GeekyBot <= 1.2.2 versions (10.0 CRITICAL)
  • CVE-2026-39591 — Subscriber Arbitrary File Upload in WP-BusinessDirectory <= 4.0.0 versions (9.9 CRITICAL)
  • CVE-2026-39527 — Subscriber Arbitrary File Upload in WpStream < 4.11.2 versions (5.4 MEDIUM)