CVE-2021-3915
Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
- Record
CVE-2021-3915- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
EUVDEUVD-2021-2401
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
- Record
EUVD-2021-2401- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-w2f4-hxpm-mq98
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type.
- Record
GHSA-w2f4-hxpm-mq98- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
NVD
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
- Record
CVE-2021-3915- CVSS 3.1
- 5.7 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N - CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:H - CVSS 2.0
- 3.5 Low
AV:N/AC:M/Au:S/C:P/I:N/A:N - Weakness
- CWE-434
- Updated
- 2026-11-02
OSV
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
- Record
CVE-2021-3915- CVSS 3.1
- 5.7 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-w2f4-hxpm-mq98
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type.
- Record
GHSA-w2f4-hxpm-mq98- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
ssddanbrown/bookstackPackagist |
before 21.0.3 | 21.0.3 |
ssddanbrown/bookstackPackagist |
before 21.0.3, plus listed versions 0.7.2V0.7.5v0.10.0v0.11.0v0.11.1 Show 45 moreShow lessv0.11.2v0.12.0v0.12.1v0.12.2v0.13.0v0.13.1v0.14.0v0.14.1v0.14.2v0.14.3v0.15.0v0.15.1v0.15.2v0.15.3v0.16.0v0.16.1v0.16.2v0.16.3v0.17.0v0.17.1v0.17.2v0.17.3v0.17.4v0.18.0v0.18.1v0.18.2v0.18.3v0.18.4v0.18.5v0.19.0v0.20.0v0.20.1v0.20.2v0.20.3v0.21.0v0.22.0v0.23.0v0.23.1v0.23.2v0.24.0v0.24.1v0.24.2v0.24.3v0.25.0v0.25.1 |
21.0.3 |
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-2021-3915 is a high vulnerability (CVSS 7.6) in Bookstackapp Bookstack, published November 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.96%, the 61st percentile. Fixed in ssddanbrown/bookstack 21.0.3.
References
Left out here: 56 versions. The JSON record has them.