# CVE-2026-73699: FileRun PHP object injection in permission deserialization

Source: https://junglewise.ai/threats/cve-2026-73699-filerun-php-object-injection-in-permission-deserialization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-73699 · Severity: high · CVSS 7.2 · Published 2026-09-10

FileRun is a self-hosted file management and sharing platform. A PHP object injection flaw in the permissions system allows authenticated attackers with database write access to execute arbitrary code by injecting malicious serialized objects. When combined with a separate SQL injection vulnerability, attackers can escalate from delegated administrator privileges to full remote code execution.

Technologies: [FileRun](https://junglewise.ai/threats/technologies/filerun). Vendors: [FileRun](https://junglewise.ai/threats/vendors/filerun).

## Quick answers

**Is CVE-2026-73699 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-73699 being exploited in the wild.

**How severe is CVE-2026-73699?** High severity, with a CVSS score of 7.2, published 10 September 2026.

**Which products and versions are affected?** FileRun before 2026.3.0.

**Is there a fix for CVE-2026-73699?** A patch was published on 2026-09-06: Fixed in FileRun 2026.3.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-73699 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-73699?** Check whether you run FileRun at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

CVE-2026-73699 is a PHP object injection (deserialization) vulnerability in the Perms::getPerms() method caused by improper use of unserialize(). The vulnerability occurs because the code passes a positional array instead of a named-key array to disable class instantiation, allowing attackers to instantiate arbitrary classes. While this vulnerability requires initial database write access, it is weaponized by CVE-2026-73698 (a SQL injection affecting delegated administrators) to write arbitrary files to web-accessible paths. The payload executes on every authenticated page load, making it a reliable exploitation vector. FileRun 2026.3.0 (released September 6, 2026) patches this vulnerability; prior versions including 2026.2.0 and 2026.2.1 are affected.

## Affected products

- FileRun FileRun before 2026.3.0

## Timeline

- 2026-09-10: disclosed
- 2026-09-06: patched: Fixed in FileRun 2026.3.0

## References

- [https://filerun.com/index.php/changelog?v=2026.3.0](https://filerun.com/index.php/changelog?v=2026.3.0)
- [https://vulncheck.com/blog/filerun-delegated-admin-sql-to-object-injection-rce](https://vulncheck.com/blog/filerun-delegated-admin-sql-to-object-injection-rce)

## Related threats

- [FileRun SQL injection in admin description field](https://junglewise.ai/threats/cve-2026-73698-filerun-sql-injection-in-admin-description-field)
- [FileRun OS command injection in CLI.php escapeshellcmd redefinition](https://junglewise.ai/threats/cve-2026-73694-filerun-os-command-injection-in-cli-php-escapeshellcmd)
- [FileRun OS command injection in PhotoProofSheet handler](https://junglewise.ai/threats/cve-2026-73693-filerun-os-command-injection-in-photoproofsheet-handler)