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All users running the calibre Content Server with authentication enabled are affected. The vulnerability is exploitable by any authenticated user and can also be triggered by tricking an authenticated victim into clicking a crafted link. Version 9.4.0 contains a fix for the issue.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-27810","reference_id":"","reference_type":"","scores":[{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16461","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16231","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16228","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16186","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16059","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16523","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16319","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16404","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16463","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16448","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16409","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16346","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16283","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16303","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00052","scoring_system":"epss","scoring_elements":"0.16338","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00057","scoring_system":"epss","scoring_elements":"0.17486","published_at":"2026-05-07T12:55:00Z"},{"value":"0.00057","scoring_system":"epss","scoring_elements":"0.17583","published_at":"2026-05-09T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-27810"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-27810","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-27810"},{"reference_url":"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw","reference_id":"GHSA-5fpj-fxw7-8grw","reference_type":"","scores":[{"value":"6.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-02T12:53:21Z/"}],"url":"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/921612?format=json","purl":"pkg:deb/debian/calibre@9.4.0%2Bds%2B~0.10.5-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.4.0%252Bds%252B~0.10.5-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/582195?format=json","purl":"pkg:deb/debian/calibre@9.6.0%2Bds%2B~0.10.5-5?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.6.0%252Bds%252B~0.10.5-5%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/1041946?format=json","purl":"pkg:deb/debian/calibre@9.6.0%2Bds%2B~0.10.5-6?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.6.0%252Bds%252B~0.10.5-6%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/1062443?format=json","purl":"pkg:deb/debian/calibre@9.7.0%2Bds%2B~0.10.5-2?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.7.0%252Bds%252B~0.10.5-2%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/1102898?format=json","purl":"pkg:deb/debian/calibre@9.8.0%2Bds%2B~0.10.5-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.8.0%252Bds%252B~0.10.5-1%3Fdistro=trixie"}],"aliases":["CVE-2026-27810"],"risk_score":2.9,"exploitability":"0.5","weighted_severity":"5.8","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-hgmk-8s7s-tfdb"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/97049?format=json","vulnerability_id":"VCID-nj3z-4ya4-bqf7","summary":"calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.4.0, the calibre Content Server's brute-force protection mechanism uses a ban key derived from both `remote_addr` and the `X-Forwarded-For` header. Since the `X-Forwarded-For` header is read directly from the HTTP request without any validation or trusted-proxy configuration, an attacker can bypass IP-based bans by simply changing or adding this header, rendering the brute-force protection completely ineffective. This is particularly dangerous for calibre servers exposed to the internet, where brute-force protection is the primary defense against credential stuffing and password guessing attacks. Version 9.4.0 contains a fix for the issue.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-27824","reference_id":"","reference_type":"","scores":[{"value":"0.0002","scoring_system":"epss","scoring_elements":"0.0544","published_at":"2026-04-08T12:55:00Z"},{"value":"0.0002","scoring_system":"epss","scoring_elements":"0.05368","published_at":"2026-04-02T12:55:00Z"},{"value":"0.0002","scoring_system":"epss","scoring_elements":"0.05461","published_at":"2026-04-09T12:55:00Z"},{"value":"0.0002","scoring_system":"epss","scoring_elements":"0.05398","published_at":"2026-04-04T12:55:00Z"},{"value":"0.0002","scoring_system":"epss","scoring_elements":"0.05405","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07692","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.077","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07679","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07646","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07626","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07722","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07707","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07617","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07605","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00027","scoring_system":"epss","scoring_elements":"0.07756","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00029","scoring_system":"epss","scoring_elements":"0.08221","published_at":"2026-05-09T12:55:00Z"},{"value":"0.00029","scoring_system":"epss","scoring_elements":"0.08156","published_at":"2026-05-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-27824"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-27824","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-27824"},{"reference_url":"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-vhxc-r7v8-2xrw","reference_id":"GHSA-vhxc-r7v8-2xrw","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-02T12:54:19Z/"}],"url":"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-vhxc-r7v8-2xrw"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/921612?format=json","purl":"pkg:deb/debian/calibre@9.4.0%2Bds%2B~0.10.5-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.4.0%252Bds%252B~0.10.5-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/582195?format=json","purl":"pkg:deb/debian/calibre@9.6.0%2Bds%2B~0.10.5-5?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.6.0%252Bds%252B~0.10.5-5%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/1041946?format=json","purl":"pkg:deb/debian/calibre@9.6.0%2Bds%2B~0.10.5-6?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.6.0%252Bds%252B~0.10.5-6%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/1062443?format=json","purl":"pkg:deb/debian/calibre@9.7.0%2Bds%2B~0.10.5-2?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.7.0%252Bds%252B~0.10.5-2%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/1102898?format=json","purl":"pkg:deb/debian/calibre@9.8.0%2Bds%2B~0.10.5-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.8.0%252Bds%252B~0.10.5-1%3Fdistro=trixie"}],"aliases":["CVE-2026-27824"],"risk_score":2.4,"exploitability":"0.5","weighted_severity":"4.8","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-nj3z-4ya4-bqf7"}],"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/calibre@9.4.0%252Bds%252B~0.10.5-1%3Fdistro=trixie"}