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
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/server/connection.rs (technical-description)
- github.com/rustdesk/rustdesk (product)
- www.vulncheck.com/advisories/rustdesk-before-1.5.0-missing-authorization-check-… (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.