Auth bypass in Rustdesk
CVE-2026-100417
RustDesk before 1.5.0 on Windows fails to enforce the one-way file transfer option against peer clipboard file requests, allowing authenticated peers to read files from the host clipboard. Attackers can send FormatDataRequest and FileContentsRequest messages to retrieve copied files by guessing the FileGroupDescriptorW format identifier.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/rustdesk/rustdesk/pull/16333 (issue-tracking, patch)
- github.com/rustdesk/rustdesk/commit/f299fb9906006247863250d7dfaa016f29eef7a4 (patch)
- github.com/rustdesk/rustdesk/blob/1.4.9/src/ui_cm_interface.rs (technical-description)
- github.com/rustdesk/rustdesk/blob/1.4.9/libs/clipboard/src/windows/wf_cliprdr.c (technical-description)
- github.com/rustdesk/rustdesk (product)
- www.vulncheck.com/advisories/rustdesk-before-1.5.0-one-way-file-transfer-bypass (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100417?
- CVE-2026-100417 is a low-severity vulnerability in Rustdesk, classified under Missing Authorization. CVSS score: 3.1/10. Published 2026-09-25.
- How severe is CVE-2026-100417?
- Low severity. CVSS v3 base score is 3.1 out of 10.