Auth bypass in Rustdesk
CVE-2026-100388
RustDesk versions before 1.5.0 fail to properly validate file transfer permissions on incoming file clipboard messages in the Cliprdr message handler on Linux and macOS. Authenticated remote peers with disabled file transfer permissions can place files onto the host clipboard and retrieve copied files and contents from the process-wide clipboard cache.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (7.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.3% 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
- Pull Request #16333 (issue-tracking, patch)
- Patch Commit (patch)
- github.com/rustdesk/rustdesk/blob/1.4.9/src/server/connection.rs (technical-description)
- github.com/rustdesk/rustdesk (product)
- VulnCheck Advisory: RustDesk before 1.5.0 Missing Authorization Check on Incoming File Clipboard Messages (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100388?
- CVE-2026-100388 is a medium-severity vulnerability in Rustdesk, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-09-25.
- How severe is CVE-2026-100388?
- Medium severity. CVSS v3 base score is 5.4 out of 10.