CVE-2026-85618: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in C4illin ConvertX
Description
ConvertX 0.17.0 contains an arbitrary file read vulnerability in the xelatex converter that allows authenticated users to read files by uploading LaTeX files with input directives. Attackers can upload .tex files containing \\input{path} or \\verbatiminput{path} directives to have the TeX engine read arbitrary files accessible to the server process and include them in downloadable PDF output.
CVSS v4.0
Score 7.1high
Affected software
C4illin
ConvertX
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-85618 is an arbitrary file read vulnerability in ConvertX (versions up to 0.18.0) within the xelatex converter component. Authenticated users can upload LaTeX (.tex) files containing \input{path} or \verbatiminput{path} directives, causing the TeX engine to read arbitrary files on the server. These files are then included in the downloadable PDF output, enabling unauthorized disclosure of server file contents.
Potential Impact
An attacker with authentication privileges can read arbitrary files on the server that the ConvertX process has access to. This can lead to exposure of sensitive information stored on the server. There is no indication of privilege escalation or remote code execution from this vulnerability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to authenticated users and monitor for suspicious LaTeX file uploads. Avoid exposing sensitive files to the ConvertX process.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-04T11:03:33.315Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9adb41acd9273b49bef502
Added to database: 09/04/2026, 14:52:49 UTC
Last enriched: 09/15/2026, 00:00:09 UTC
Last updated: 10/19/2026, 18:48:24 UTC
Views: 99
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.