{"id":"CVE-2021-4171","aliases":["GHSA-xp7p-3gx7-j6wx","PYSEC-2026-307"],"title":"calibre-web is vulnerable to Business Logic Errors","summary":"calibre-web is vulnerable to Business Logic Errors","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"calibreweb","product":"calibreweb","ecosystem":"pip","affected":["calibreweb < 0.6.15"],"patched":["calibreweb 0.6.15"],"published":"2022-01-21","updated":"2026-10-27","sourceUpdated":"2026-10-27T16:30:05.977964866Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-xp7p-3gx7-j6wx","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-4171"},{"url":"https://github.com/janeczku/calibre-web/commit/3e0d8763c377d2146462811e3e4ccf13f0d312ce"},{"url":"https://github.com/janeczku/calibre-web"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/calibreweb/PYSEC-2026-307.yaml"},{"url":"https://huntr.dev/bounties/1117f439-133c-4563-afb2-6cd80607bd5c"},{"url":"https://pypi.org/project/calibreweb"},{"url":"https://github.com/advisories/GHSA-xp7p-3gx7-j6wx"}],"tags":["osv","pip","ghsa"],"epss":0.01387,"epssPercentile":0.72103,"ingestedAt":"2026-10-27T16:32:34.372Z","slug":"CVE-2021-4171","body":"## Overview\n\ncalibre-web is vulnerable to Business Logic Errors\n\n## Affected packages\n\n- `calibreweb < 0.6.15`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `calibreweb 0.6.15`","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}