{"cve":"CVE-2021-3986","nvd":{"published":"2024-11-15T11:15:06.400","modified":"2026-06-17T04:06:20.653","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3},"cwes":["CWE-209"],"references":["https://github.com/janeczku/calibre-web/commit/6f5390ead5df9779ac81fadefffb476e03f93548","https://huntr.com/bounties/394af194-61a7-4e33-b373-877d4c766fca"],"products":["janeczku:calibre-web"],"source":"nvd","synced_at":"2026-10-19T21:57:07.693694550+00:00"},"epss":{"cve":"CVE-2021-3986","score":0.00371,"percentile":0.31026,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-m982-h4f8-g4hf","url":"https://osv.dev/vulnerability/GHSA-m982-h4f8-g4hf","summary":"Generation of Error Message Containing Sensitive Information in janeczku/calibre-web","modified":"2026-07-07T17:57:20.871568185Z","packages":[{"ecosystem":"PyPI","name":"calibreweb","purl":"pkg:pypi/calibreweb","ranges":["<0.6.15"],"fixed":["0.6.15"]}]},{"id":"PYSEC-2026-1232","url":"https://osv.dev/vulnerability/PYSEC-2026-1232","summary":"Generation of Error Message Containing Sensitive Information in janeczku/calibre-web","modified":"2026-07-07T17:47:24.626766834Z","packages":[{"ecosystem":"PyPI","name":"calibreweb","purl":"pkg:pypi/calibreweb","ranges":["<0.6.15"],"fixed":["0.6.15"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}