CVE-2026-14863 FileRun CVE debrief

Who should care

System administrators and security teams responsible for FileRun instances, particularly those allowing untrusted uploads or using version 2026.2.0 or earlier, should assess exposure and prioritize patching or mitigations. These teams should review and enhance authentication and authorization controls, restrict file uploads, or monitor for suspicious activity to mitigate potential risks. Additionally, defenders should verify affected versions and apply

Why it matters

CVE-2026-14863 is a high-severity OS command injection vulnerability in FileRun that allows authenticated remote code execution. Defenders should assess exposure, prioritize patching or mitigations, and monitor for suspicious activity.

• Remote code execution requires authentication and file upload
• Thumbnail generation processing of malicious filenames leads to command injection
• Verify affected versions and apply patches or mitigations
• Restrict file uploads or monitor for suspicious activity

Technical summary

The vulnerability exists in the thumbnail generation system of FileRun, which passes filenames wrapped in shell double-quotes directly to exec() without escapeshellarg() sanitization. This allows authenticated attackers to achieve remote code execution by uploading a file with a malicious filename containing shell command substitution sequences. The vulnerability affects FileRun version 2026.2.0 and earlier, enabling attackers to execute arbitrary commands on the system. Defenders should assess exposure, prioritize patching or mitigations, and monitor for suspicious activity.

Defensive priority

High priority for systems using FileRun version 2026.2.0 or earlier. Assess exposure and apply patches or mitigations.

Recommended defensive actions

• Assess exposure of FileRun instances to untrusted uploads
• Verify version and apply patches or updates if available
• Implement mitigations such as restricting file uploads or monitoring for suspicious activity
• Review and enhance authentication and authorization controls
• Track exceptions and retest remediated assets
• Check relevant monitoring, detection, and logs for exposed assets
• Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, the scope of affected versions and potential impact require further verification. The vulnerability allows authenticated remote code execution through malicious filename uploads. The thumbnail generation system's lack of proper sanitization enables attackers to inject shell commands. The CVE Program and NVD detail pages offer initial insights, but defenders should verify affected versions, assess exposure, and apply patches or mitigations as needed. Additional

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.