Auth bypass in Rustdesk
CVE-2026-57850
RustDesk before 1.4.9 does not enforce a session's authorized connection scope on the server side, so a peer granted a limited session type (FileTransfer, PortForward, ViewCamera, or Terminal) can send control messages and login options reserved for a full Remote session. An authenticated remote peer can exploit this missing scope check to act outside its granted scope, injecting out-of-scope control messages to observe and control the host beyond the permissions it was given.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.005 (40.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Rustdesk — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/rustdesk/rustdesk/pull/15469 (issue-tracking, patch)
- github.com/rustdesk/rustdesk/commit/493b14ba78abc3dfb33f109c7f93c1c95a1dabc4 (patch)
- github.com/rustdesk/rustdesk/releases/tag/1.4.9 (release-notes)
- github.com/rustdesk/rustdesk (product)
- www.vulncheck.com/advisories/rustdesk-missing-session-scope-enforcement-allows-… (third-party-advisory)
- github.com/sn0x-sharma/CVE-2026-57850 (technical-description)
Frequently asked questions
- What is CVE-2026-57850?
- CVE-2026-57850 is a high-severity vulnerability in Rustdesk, classified under Missing Authorization. CVSS score: 8.3/10. Published 2026-07-10.
- How severe is CVE-2026-57850?
- High severity. CVSS v3 base score is 8.3 out of 10.
- Is CVE-2026-57850 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.