{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-06-15T16:56:07.107","vulnerabilities":[{"cve":{"id":"CVE-2026-27824","sourceIdentifier":"security-advisories@github.com","published":"2026-02-27T20:21:39.973","lastModified":"2026-03-04T16:39:05.407","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"calibre es un gestor de libros electrónicos multiplataforma para ver, convertir, editar y catalogar libros electrónicos. Antes de la versión 9.4.0, el mecanismo de protección contra fuerza bruta del servidor de contenido de calibre utiliza una clave de prohibición derivada tanto de 'remote_addr' como del encabezado 'X-Forwarded-For'. Dado que el encabezado 'X-Forwarded-For' se lee directamente de la solicitud HTTP sin ninguna validación o configuración de proxy de confianza, un atacante puede eludir las prohibiciones basadas en IP simplemente cambiando o añadiendo este encabezado, lo que hace que la protección contra fuerza bruta sea completamente ineficaz. Esto es particularmente peligroso para los servidores de calibre expuestos a internet, donde la protección contra fuerza bruta es la defensa principal contra ataques de relleno de credenciales y adivinación de contraseñas. La versión 9.4.0 contiene una solución para el problema."}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":1.4},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":1.4}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-307"},{"lang":"en","value":"CWE-346"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:calibre-ebook:calibre:*:*:*:*:*:*:*:*","versionEndExcluding":"9.4.0","matchCriteriaId":"3665E54E-5F8D-405A-BA97-8DD783962094"}]}]}],"references":[{"url":"https://github.com/kovidgoyal/calibre/security/advisories/GHSA-vhxc-r7v8-2xrw","source":"security-advisories@github.com","tags":["Exploit","Vendor Advisory"]}]}}]}