What’s Vulnerable › Vulnerabilities

CVE-2021-3916: Path Traversal in bookstackapp/bookstack

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-05 · updated 2026-06-17
• Weakness: CWE-22

Description

bookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected products

• bookstackapp/bookstack: before 21.10.3 — fixed in 21.10.3

How to fix

Upgrade to a fixed version: bookstackapp/bookstack 21.10.3. Check the vendor advisory for mitigations.

References

• https://github.com/bookstackapp/bookstack/commit/43830a372fc51a8793199d04a34c3f4ebdfccc7b
• https://huntr.dev/bounties/0be32e6b-7c48-43f0-9cec-433000ad8f64
• https://github.com/bookstackapp/bookstack/commit/43830a372fc51a8793199d04a34c3f4ebdfccc7b
• https://huntr.dev/bounties/0be32e6b-7c48-43f0-9cec-433000ad8f64

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