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
EPSS: 0.002 (10.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
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)
- VulnCheck Advisory: 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.