# CVE-2026-73693: FileRun OS command injection in PhotoProofSheet handler

Source: https://junglewise.ai/threats/cve-2026-73693-filerun-os-command-injection-in-photoproofsheet-handler  
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-2026-73693 · Severity: high · CVSS 8.8 · Published 2026-09-10

FileRun is a self-hosted file manager and sharing platform. The PhotoProofSheet feature, which creates thumbnail contact sheets for images, fails to sanitize filenames before passing them to the shell for image processing. An authenticated user with upload permissions can craft a malicious filename containing shell commands (like backticks or $() sequences) to execute arbitrary system commands as the web server user, potentially gaining full control of the server.

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

## Quick answers

**Is CVE-2026-73693 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-73693 being exploited in the wild.

**How severe is CVE-2026-73693?** High severity, with a CVSS score of 8.8, published 10 September 2026.

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

**Is there a fix for CVE-2026-73693?** A patch was published on 2026-09-06: FileRun 2026.3.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-73693 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-73693?** 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-2026-73693 is an OS command injection vulnerability (CWE-78) in FileRun's PhotoProofSheet handler, which constructs an ImageMagick montage command by wrapping filenames in double quotes and passing the resulting string to the shell. Double quotes do not prevent shell command substitution, allowing an attacker to inject commands via $(...) syntax or other shell metacharacters in the filename. The vulnerability requires authentication with upload permission; the attacker uploads a weaponized image file with command syntax in its name and then triggers the PhotoProofSheet endpoint to process it. The root cause is the absence of proper escaping (escapeshellarg()) around the filename parameters. FileRun 2026.3.0, released September 6, 2026, patches this vulnerability.

## Affected products

- FileRun FileRun before 2026.3.0

## Timeline

- 2026-09-10: disclosed
- 2026-09-06: patched: 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 PHP object injection in permission deserialization](https://junglewise.ai/threats/cve-2026-73699-filerun-php-object-injection-in-permission-deserialization)
- [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)