SB2026092101 - Input validation error in Calibre

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026092101

SB2026092101 - Input validation error in Calibre

Published: September 21, 2026

Security Bulletin ID SB2026092101
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Input validation error (CVE-ID: N/A)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References