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CVE-2021-4171 — Vulnerability in calibreweb — CVE Details

CRITICAL

calibre-web is vulnerable to Business Logic Errors

Published June 29, 2026Updated July 1, 2026Source: osv

Summary

calibre-web is vulnerable to Business Logic Errors

Advisory Timeline

  • First published June 29, 2026 (105 days ago).
  • Last revised July 1, 2026 — 2 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update calibreweb to 0.6.15 or later
pip install "calibreweb>=0.6.15"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
calibreweb
pypi
0.6.12, 0.6.13, 0.6.140.6.15

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2021-4171?
calibre-web is vulnerable to Business Logic Errors This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2021-4171?
CVE-2021-4171 affects calibreweb. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-4171 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

PYSEC-2026-307
GHSA-xp7p-3gx7-j6wx

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