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TI-2021-02884 Aliases CVE-2021-3987GHSA-fj5v-w2jp-wqvj

Improper Access Control in janeczku/calibre-web

Priority MEDIUM 53CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00346 28th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed calibreweb (PyPI): 0.6.15

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
janeczkujaneczku/calibre-webup to latest—No fix listedCNA
—calibreweb (PyPI)before 0.6.150.6.15Patch availableGHSA-fj5v-w2jp-wqvj
  • janeczku/calibre-web Vendorjaneczku Affected up to latest Fixed in — No fix listed CNA
  • calibreweb (PyPI) Vendor— Affected before 0.6.15 Fixed in 0.6.15 Patch available GHSA-fj5v-w2jp-wqvj

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:janeczku:calibre-web:*:*:*:*:*:*:*:*before 0.6.15Vulnerablejaneczku
  • cpe:2.3:a:janeczku:calibre-web:*:*:*:*:*:*:*:* Versions before 0.6.15 Vulnerable ·janeczku

Remediation

  • Fix · GHSA-fj5v-w2jp-wqvj calibreweb (PyPI) Fixed in 0.6.15 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3987
  2. 2026-10-03 Alias added: GHSA-fj5v-w2jp-wqvj

References

Exploit 1

Patch 1

Advisory 1

Other 1

  • TI-2023-01981 Weak Password Requirements in janeczku/calibre-web CVSS 3.1CRITICAL 9.8
  • TI-2022-02333 Improper Restriction of Excessive Authentication Attempts in janeczku/calibre-web CVSS 3.1CRITICAL 9.8
  • TI-2021-07971 Calibre-web - Admin Account Takeover via Cross-Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
  • TI-2025-06745 Calibre Web 0.6.24 & Autocaliweb 0.7.0 - Blind C CVSS 4.0MEDIUM 5.9
  • TI-2021-02885 Cross-site Scripting (XSS) in janeczku/calibre-web CVSS 3.1MEDIUM 6.1
  • TI-2024-26178 In janeczku Calibre-Web 0.6.0 to 0.6.21, the edit_book_comments function is vulnerable to… CVSS 3.1MEDIUM 5.4
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences