Authenticated code execution via unsafe permission deserialization
Published Sep 10, 2026 · Updated Sep 10, 2026
PHP object injection in FileRun before 2026.3.0 allows remote authenticated users to execute arbitrary code through stored permission data. Perms::getPerms() passes a positional options array to unserialize() instead of the required named-key array, leaving class instantiation enabled for permission-table values. Exploitation requires database write access; a serialized gadget chain is then processed on authenticated page loads and can write executable files into web-accessible paths.
Summary
What happened
PHP object injection in FileRun before 2026.3.0 allows remote authenticated users to execute arbitrary code through stored permission data. Perms::getPerms() passes a positional options array to unserialize() instead of the required named-key array, leaving class instantiation enabled for permission-table values. Exploitation requires database write access; a serialized gadget chain is then processed on authenticated page loads and can write executable files into web-accessible paths.
The record
- CVE
- CVE-2026-73699
- Published
- Sep 10, 2026
- Updated
- Sep 10, 2026
- Vendor
- FileRun
- Product
- FileRun
- Classifications
- T1505.003
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 10, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <2026.3.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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