CVE-2021-3758
Server-Side Request Forgery (SSRF) in bookstackapp/bookstack
bookstack is vulnerable to Server-Side Request Forgery (SSRF)
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- 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
Server-Side Request Forgery (SSRF) in bookstackapp/bookstack
bookstack is vulnerable to Server-Side Request Forgery (SSRF)
- Record
CVE-2021-3758- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
EUVDEUVD-2021-27031
bookstack is vulnerable to Server-Side Request Forgery (SSRF)
- Record
EUVD-2021-27031- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-gj43-r55q-5h6r No score
bookstack is vulnerable to Server-Side Request Forgery (SSRF)
bookstack is vulnerable to Server-Side Request Forgery (SSRF)
- Record
GHSA-gj43-r55q-5h6r- Weakness
- CWE-918
- Updated
- 2026-11-02
NVD
bookstack is vulnerable to Server-Side Request Forgery (SSRF)
- Record
CVE-2021-3758- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:N/I:P/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
OSV
bookstack is vulnerable to Server-Side Request Forgery (SSRF)
- Record
CVE-2021-3758- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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-2021-3758 is a medium vulnerability (CVSS 6.3) in Bookstackapp Bookstack, published September 2, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.80%, the 56th percentile. No source names a fixed version.