CVE-2026-73693
Received Received - Intake

Authenticated OS Command Injection in FileRun via Malicious Filename

Publication date: 2026-09-10

Last updated on: 2026-09-10

Assigner: VulnCheck

Description
FileRun before 2026.3.0 contains an OS command injection vulnerability in the PhotoProofSheet handler that allows authenticated users with upload permission to execute arbitrary commands by uploading files with shell metacharacters in their names. Attackers can upload a file containing command substitution syntax such as backticks, semicolons, or $() sequences in the filename, then trigger the PhotoProofSheet endpoint to execute arbitrary commands as the web-server user due to missing escapeshellarg() sanitization in the ImageMagick montage command construction.

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Meta Information

Published
2026-09-10
Last Modified
2026-09-10
Generated
2026-09-10
AI Q&A
2026-09-10
EPSS Evaluated
N/A
NVD
CVE-2026-73693
EUVD
EUVD-2026-75598

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
filerun filerun to 2026.3.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

FileRun before version 2026.3.0 has an OS command injection flaw in the PhotoProofSheet handler. Authenticated users with upload rights can run arbitrary commands by uploading files with shell metacharacters like backticks, semicolons, or $() in filenames. The application fails to properly escape these characters when constructing ImageMagick montage commands, allowing command execution as the web-server user.

Detection Guidance

Check FileRun versions prior to 2026.3.0 for the PhotoProofSheet handler. Look for uploaded files with shell metacharacters like backticks, semicolons, or $() in filenames. Review ImageMagick montage command logs for improperly escaped filenames.

Impact Analysis

This vulnerability allows attackers with upload access to execute arbitrary commands on the server. This could lead to full system compromise, data theft, or unauthorized modifications. The impact depends on the server's permissions and the commands executed.

Mitigation Strategies

Upgrade FileRun to version 2026.3.0 or later immediately. Remove or rename any suspicious files with shell metacharacters in filenames. Restrict upload permissions to trusted users only. Monitor for unauthorized command execution attempts.

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