CVE-2021-3987
Improper Access Control in janeczku/calibre-web
An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the create_shelf method in shelf.py not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users.
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
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Improper Access Control in janeczku/calibre-web
An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the create_shelf method in shelf.py not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users.
- Record
CVE-2021-3987- CVSS 3.0
- 5.4 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2024-3244
An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the create_shelf method in shelf.py not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users.
- Record
EUVD-2024-3244- CVSS 3.0
- 5.4 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-fj5v-w2jp-wqvj
Improper Access Control in janeczku/calibre-web
An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the create_shelf method in shelf.py not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users.
- Record
GHSA-fj5v-w2jp-wqvj- CVSS 3.0
- 5.4 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-284, CWE-862
- Updated
- 2026-11-02
NVD
An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the create_shelf method in shelf.py not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users.
- Record
CVE-2021-3987- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - CVSS 3.0
- 5.4 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-284, CWE-862
- Updated
- 2026-11-02
OSV
An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the create_shelf method in shelf.py not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users.
- Record
CVE-2021-3987- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-fj5v-w2jp-wqvj
Improper Access Control in janeczku/calibre-web
An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the create_shelf method in shelf.py not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users.
- Record
GHSA-fj5v-w2jp-wqvj- CVSS 3.0
- 5.4 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-284, CWE-862
- Updated
- 2026-11-02
OSVPYSEC-2026-1229
Improper Access Control in janeczku/calibre-web
An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. The vulnerability is due to the create_shelf method in shelf.py not verifying if the user has the necessary permissions to create a public shelf. This issue can lead to unauthorized actions being performed by users.
- Record
PYSEC-2026-1229- CVSS 3.0
- 5.4 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
calibrewebPyPI |
before 0.6.15 | 0.6.15 |
calibrewebPyPI |
before 0.6.15, plus listed versions 0.6.120.6.130.6.14 |
0.6.15 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3987 is a medium vulnerability (CVSS 5.4) in Calibre-web Project Calibre-web, published November 15, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.35%, the 28th percentile. Fixed in calibreweb 0.6.15.