CVE-2026-73699
Received Received - Intake

PHP Object Injection in FileRun Before 2026.3.0

Publication date: 2026-09-10

Last updated on: 2026-09-10

Assigner: VulnCheck

Description
FileRun before 2026.3.0 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary code by exploiting incorrect options passed to unserialize() in the Perms::getPerms() method, where a positional array is used instead of the required named-key array to disable class instantiation. Attackers with database write access can inject a serialized gadget chain into the permissions table columns processed on every authenticated page load to write arbitrary files, such as PHP webshells, to web-accessible paths.

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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-2026-73699
EUVD
EUVD-2026-75601

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-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

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Executive Summary

FileRun before version 2026.3.0 has a PHP object injection flaw in the Perms::getPerms() method. Due to incorrect options passed to unserialize(), attackers with database write access can inject a serialized gadget chain into permissions table columns. This is processed on every authenticated page load, allowing arbitrary file writes like PHP webshells to web-accessible paths.

Detection Guidance

Check FileRun versions prior to 2026.3.0 for the vulnerability. Look for unauthorized file writes in web-accessible directories, especially PHP files. Review database permissions tables for unexpected serialized data or gadget chains.

Impact Analysis

An attacker with database write access could exploit this to execute arbitrary code on your server by writing malicious files. This could lead to full system compromise, data theft, or further network infiltration. The impact is high severity with a CVSS score of 8.6.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations may face compliance violations, fines, or legal consequences if exploited.

Mitigation Strategies

Upgrade FileRun to version 2026.3.0 or later immediately. Ensure request fields are cast to strings before database insertion. Restrict database write access to authorized users only. Monitor for unauthorized file creation in web directories.

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