Calibre
Monthly
Calibre versions prior to 9.6.0 allow remote attackers to exfiltrate arbitrary files from the host system through a combination of path traversal in image handling during file conversion and unauthenticated server-side request forgery in the ebook reader web view's background-image endpoint. An attacker can craft a malicious markdown or text-based file that references files outside the intended directory, then retrieve those files through the unprotected background-image handler without authentication, enabling complete file system disclosure on systems running vulnerable Calibre instances.
Server-Side Request Forgery in calibre's background-image endpoint allows remote attackers to perform blind GET requests to arbitrary URLs and exfiltrate sensitive information from the e-book sandbox prior to version 9.6.0. Calibre versions before 9.6.0 are affected, with vendor-released patch available at version 9.6.0 or later. No active exploitation or public exploit code has been confirmed at time of analysis.
Arbitrary file write vulnerability in Calibre's RocketBook input plugin enables attackers to write files to any location accessible by the Calibre process when a user opens or converts a malicious .rb file. The path traversal flaw affects versions prior to 9.5.0 and represents an unpatched instance of the same vulnerability class previously fixed in the PDB reader component. Local attackers can leverage this to corrupt files, modify configuration, or potentially achieve code execution depending on file system permissions.
Calibre Content Server's brute-force protection can be bypassed by manipulating the X-Forwarded-For HTTP header, allowing attackers to circumvent IP-based account lockouts and conduct credential stuffing attacks. Public exploit code exists for this vulnerability, which affects Calibre versions prior to 9.4.0 and poses a significant risk to internet-exposed servers where brute-force protection is the primary authentication defense mechanism. No patch is currently available for affected versions.
HTTP response header injection in Calibre Content Server prior to version 9.4.0 permits authenticated users to inject arbitrary headers through an unsanitized query parameter, potentially enabling cache poisoning, session fixation, or credential theft attacks. Any authenticated user can exploit this vulnerability directly or via social engineering, affecting all instances with authentication enabled. Public exploit code exists and no patch is currently available.
Calibre versions 9.2.1 and below allow authenticated users to write arbitrary files with any extension to any writable location via path traversal in PDB file readers, potentially enabling code execution or system compromise through file overwriting. The vulnerability affects both 132-byte and 202-byte PDB header variants and silently overwrites existing files without warning. Public exploit code exists and patches are available in version 9.3.0 and later.
Remote code execution in Calibre 9.2.1 and earlier allows authenticated users to write arbitrary files via a path traversal flaw in the extract_pictures() function that fails to properly sanitize directory traversal sequences. On Windows systems, attackers can exploit this to write malicious payloads to the Startup folder, achieving code execution upon the next user login. Public exploit code exists for this vulnerability, and a patch is available in version 9.3.0.
calibre is an e-book manager. [CVSS 7.8 HIGH]
Calibre 9.1.0 and earlier contains a path traversal vulnerability in EPUB conversion that allows malicious EPUB files to corrupt or modify arbitrary files writable by the Calibre process. The vulnerability exploits improper handling of CipherReference URIs in encryption metadata, enabling attackers to write outside the intended extraction directory. Public exploit code exists for this high-severity issue, which is patched in version 9.2.0.
Remote code execution in Calibre prior to version 9.2.0 through a path traversal flaw in the CHM reader allows local attackers to write arbitrary files with user permissions, enabling payload execution via the Windows Startup folder. Public exploit code exists for this vulnerability. Windows users should upgrade to Calibre 9.2.0 or later to remediate the risk.
Calibre versions prior to 9.6.0 allow remote attackers to exfiltrate arbitrary files from the host system through a combination of path traversal in image handling during file conversion and unauthenticated server-side request forgery in the ebook reader web view's background-image endpoint. An attacker can craft a malicious markdown or text-based file that references files outside the intended directory, then retrieve those files through the unprotected background-image handler without authentication, enabling complete file system disclosure on systems running vulnerable Calibre instances.
Server-Side Request Forgery in calibre's background-image endpoint allows remote attackers to perform blind GET requests to arbitrary URLs and exfiltrate sensitive information from the e-book sandbox prior to version 9.6.0. Calibre versions before 9.6.0 are affected, with vendor-released patch available at version 9.6.0 or later. No active exploitation or public exploit code has been confirmed at time of analysis.
Arbitrary file write vulnerability in Calibre's RocketBook input plugin enables attackers to write files to any location accessible by the Calibre process when a user opens or converts a malicious .rb file. The path traversal flaw affects versions prior to 9.5.0 and represents an unpatched instance of the same vulnerability class previously fixed in the PDB reader component. Local attackers can leverage this to corrupt files, modify configuration, or potentially achieve code execution depending on file system permissions.
Calibre Content Server's brute-force protection can be bypassed by manipulating the X-Forwarded-For HTTP header, allowing attackers to circumvent IP-based account lockouts and conduct credential stuffing attacks. Public exploit code exists for this vulnerability, which affects Calibre versions prior to 9.4.0 and poses a significant risk to internet-exposed servers where brute-force protection is the primary authentication defense mechanism. No patch is currently available for affected versions.
HTTP response header injection in Calibre Content Server prior to version 9.4.0 permits authenticated users to inject arbitrary headers through an unsanitized query parameter, potentially enabling cache poisoning, session fixation, or credential theft attacks. Any authenticated user can exploit this vulnerability directly or via social engineering, affecting all instances with authentication enabled. Public exploit code exists and no patch is currently available.
Calibre versions 9.2.1 and below allow authenticated users to write arbitrary files with any extension to any writable location via path traversal in PDB file readers, potentially enabling code execution or system compromise through file overwriting. The vulnerability affects both 132-byte and 202-byte PDB header variants and silently overwrites existing files without warning. Public exploit code exists and patches are available in version 9.3.0 and later.
Remote code execution in Calibre 9.2.1 and earlier allows authenticated users to write arbitrary files via a path traversal flaw in the extract_pictures() function that fails to properly sanitize directory traversal sequences. On Windows systems, attackers can exploit this to write malicious payloads to the Startup folder, achieving code execution upon the next user login. Public exploit code exists for this vulnerability, and a patch is available in version 9.3.0.
calibre is an e-book manager. [CVSS 7.8 HIGH]
Calibre 9.1.0 and earlier contains a path traversal vulnerability in EPUB conversion that allows malicious EPUB files to corrupt or modify arbitrary files writable by the Calibre process. The vulnerability exploits improper handling of CipherReference URIs in encryption metadata, enabling attackers to write outside the intended extraction directory. Public exploit code exists for this high-severity issue, which is patched in version 9.2.0.
Remote code execution in Calibre prior to version 9.2.0 through a path traversal flaw in the CHM reader allows local attackers to write arbitrary files with user permissions, enabling payload execution via the Windows Startup folder. Public exploit code exists for this vulnerability. Windows users should upgrade to Calibre 9.2.0 or later to remediate the risk.