CVE-2026-57491 error311 CVE debrief

Who should care

FileRise administrators and users with upload and extract permissions should be aware of this vulnerability and take necessary actions to mitigate it. Deployments that execute uploaded content are at a higher risk and should prioritize verification and remediation efforts. Security teams should review the vulnerability details and ensure that proper controls are in place to prevent exploitation.

Why it matters

CVE-2026-57491 allows an authenticated user to bypass the upload blocklist in FileRise, potentially leading to code execution in certain deployments.

• Potential code execution in deployments that execute uploaded content
• Bypass of upload blocklist for blocked file extensions
• Increased risk for FileRise deployments that execute uploaded content

Technical summary

FileRise prior to version 3.16.0 allows an authenticated user with upload and extract permissions to bypass the upload blocklist by extracting a ZIP archive containing a blocked file extension, which can potentially lead to code execution in deployments that execute uploaded content. This vulnerability is due to insufficient validation during the extraction process. The issue has been fixed in version 3.16.0, and it is recommended to upgrade to this version or later to mitigate the vulnerability. Additionally, restricting upload and extract permissions and monitoring for suspicious activity can help reduce the risk.

Defensive priority

Medium priority for FileRise deployments that execute uploaded content; verify version 3.16.0 or later is deployed.

Recommended defensive actions

• Verify FileRise version is 3.16.0 or later
• Restrict upload and extract permissions to necessary users
• Monitor for suspicious ZIP archive uploads
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, including the affected version and fixed version. The vulnerability allows an authenticated user to bypass the upload blocklist in FileRise, potentially leading to code execution in certain deployments. The issue is fixed in version 3.16.0. Additional verification is required to confirm affected scope and severity.

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.