CVE-2021-3916
Path Traversal in bookstackapp/bookstack
bookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Path Traversal in bookstackapp/bookstack
bookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- Record
CVE-2021-3916- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
EUVDEUVD-2021-27136
bookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- Record
EUVD-2021-27136- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-g66g-3vwf-hfgf No score
bookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path...
bookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- Record
GHSA-g66g-3vwf-hfgf- Weakness
- CWE-22
- Updated
- 2026-11-02
NVD
bookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- Record
CVE-2021-3916- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:P/I:N/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
OSV
bookstack is vulnerable to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- Record
CVE-2021-3916- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3916 is a medium vulnerability (CVSS 6.5) in Bookstackapp Bookstack, published November 5, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.24%, the 69th percentile. No source names a fixed version.