CVE-2021-3987

Name: CVE-2021-3987
Creator: NVD / NIST
Published: 2024-11-15T11:15:06.61+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2021-3987 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An improper access control vulnerability exists in janeczku/calibre-web. The affected version allows users without public shelf permissions to create public shelves. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.33%

25.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Janeczku	Calibre-Web	< 0.6.15

References

Timeline

Published: Nov 15, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-3987?

How severe is CVE-2021-3987?

CVE-2021-3987 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3987?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3987?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST