CVE-2026-61843 error311 CVE debrief

Who should care

FileRise administrators and users should assess exposure and upgrade to version 3.18.0 or later to prevent unauthenticated file overwrites. This vulnerability has a high CVSS score of 8.2 and is considered HIGH severity. Operators, platform administrators, vulnerability management teams, and security teams may be impacted by this vulnerability. They should review and restrict upload-enabled folder shares, monitor for suspicious file uploads and ensure the

Why it matters

CVE-2026-61843 is a high-severity vulnerability in FileRise that allows unauthenticated file overwrites, potentially leading to data loss or corruption. FileRise administrators and users should assess exposure and upgrade to version 3.18.0 or later to prevent this issue.

• Potential data loss or corruption due to file overwrites
• Increased risk of unauthorized file modifications
• Need for verification of file integrity and authenticity

Technical summary

FileRise, a self-hosted web-based file manager, has a vulnerability prior to version 3.18.0 that allows unauthenticated file overwrite through upload-enabled folder shares. An attacker with a valid share token and share password can upload a file with the same name as an existing file, silently replacing its content. The issue is fixed in version 3.18.0. This vulnerability has a high CVSS score of 8.2 and is considered HIGH severity. FileRise administrators and users should assess exposure and upgrade to version 3.18.0 or later to prevent unauthenticated file overwrites.

Defensive priority

High priority for FileRise administrators and users to upgrade to version 3.18.0.

Recommended defensive actions

• Upgrade FileRise to version 3.18.0 or later
• Review and restrict upload-enabled folder shares
• Monitor for suspicious file uploads and modifications
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, while GitHub sources offer additional context and a patch. The vulnerability allows unauthenticated file overwrites through upload-enabled folder shares in FileRise versions prior to 3.18.0. A valid share token and share password are required for exploitation. The issue is fixed in version 3.18.0. Evidence limits suggest that further verification is needed to confirm affected scope and severity. Defenders should verify file integrity and authenticity. Limited

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.