RCE in Filerun
CVE-2026-73693
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.027 (85.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000
Affected products
Weakness classification (CWE)
References
- VulnCheck Blog (technical-description, exploit)
- Release Notes (release-notes, patch)
- www.vulncheck.com/advisories/filerun-os-command-injection-via-photoproofsheet-h… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-73693?
- CVE-2026-73693 is a high-severity vulnerability in Filerun, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-09-10.
- How severe is CVE-2026-73693?
- High severity. CVSS v3 base score is 8.8 out of 10.