Generation of Error Message Containing Sensitive Information in janeczku/calibre-web
A vulnerability in janeczku/calibre-web allows unauthorized users to view the names of private shelves belonging to other users. This issue occurs in the file shelf.py at line 221, where the name of the shelf is exposed in an error message when a user attempts to remove a book from a shelf they do not own. This vulnerability discloses private information and affects all versions prior to the fix.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | calibreweb | < 0.6.15 | 0.6.15 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-3986
- https://github.com/janeczku/calibre-web/commit/6f5390ead5df9779ac81fadefffb476e03f93548
- https://github.com/janeczku/calibre-web
- https://huntr.com/bounties/394af194-61a7-4e33-b373-877d4c766fca
- https://pypi.org/project/calibreweb
- https://github.com/advisories/GHSA-m982-h4f8-g4hf
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-209- Platform
- Python (PyPI)
- Package
calibreweb- Disclosed
- 15.11.2024
- Updated
- 11.10.2026 13:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1232 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-m982-h4f8-g4hf - CC BY 4.0
Vulnerability history: calibreweb
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 18
- First → latest
- 01.2022 12.2025
- Without a fix
- 4
- Exploited in attacks
- 0
Severity breakdown
- Critical 4
- High 4
- Medium 9
- Low 1
Disclosures per year
- 2022: 9
- 2023: 2
- 2024: 4
- 2025: 3
- 2026: 0
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