CVE-2026-73227 electerm CVE debrief

Who should care

Defenders responsible for electerm installations, particularly those using RDP connections, should assess exposure and prioritize upgrading to version 3.15.120 or later to prevent potential file writes outside the intended directory.

Why it matters

CVE-2026-73227 is a high-severity vulnerability in electerm that allows a malicious RDP server to write attacker-controlled content outside the selected save directory. Defenders should prioritize upgrading to version 3.15.120 or later to prevent potential file writes outside the intended directory. This vulnerability requires verification of electerm versions and configurations to ensure secure file transfers.

• Potential for malicious RDP server to write files outside intended directory
• Need for defenders to verify electerm version and upgrade if necessary
• Possible impact on data integrity and confidentiality if exploited

Technical summary

The vulnerability exists in the RDP clipboard download path in src/client/components/rdp/file-transfer.js, where the server-controlled CLIPRDR filename fileInfo.name is passed to osResolve without sanitization, allowing a malicious RDP server to write attacker-controlled content outside the selected save directory. This issue is fixed in version 3.15.120. Defenders should prioritize upgrading to version 3.15.120 or later to prevent potential file writes outside the intended directory. The fix involves sanitizing the RDP clipboard download path to prevent writing files outside the intended directory.

Defensive priority

Defenders should prioritize upgrading to version 3.15.120 or later to prevent potential file writes outside the intended directory.

Recommended defensive actions

• Upgrade to electerm version 3.15.120 or later
• Review and update RDP connection configurations to ensure secure file transfers
• Monitor electerm installations for updates and apply patches promptly
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and references to the fix and advisory. The issue is caused by passing the server-controlled CLIPRDR filename fileInfo.name to osResolve without sanitization. To verify, defenders should review electerm versions and configurations to ensure secure file transfers. The fix is included in version 3.15.120, and defenders should prioritize upgrading to this version or later.

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.