Input validation error in Calibre - #VU151490
Published: September 21, 2026
Vulnerability identifier: #VU151490
CSH Severity: Low
CVSS v4: 7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information, perform server-side requests, and manipulate the filesystem.
The vulnerability exists due to improper input validation in the content server conversion API's conversion options when processing conversion requests. A remote privileged user can submit conversion options containing attacker-controlled filesystem paths or URLs to disclose sensitive information, perform server-side requests, and manipulate the filesystem.
Exploitation requires write access to the content server and an existing book ID.
Affected software
Calibre
Remediation
Install security update from vendor's website.
Calibre - update to 9.15.0