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Description

RustDesk gates incoming control messages on per-capability flags rather than on the session's authorized connection type, and a file-transfer session does not clear those flags. A peer holding only a valid FileTransfer authorization can inject keyboard and mouse input and reach the unguarded screenshot and display-capture handlers, acting outside its granted scope.

PUBLISHED Reserved 2026-06-28 | Published 2026-06-28 | Updated 2026-06-28 | Assigner VulnCheck




HIGH: 7.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
HIGH: 7.2CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

Problem types

Incorrect Authorization

Product status

Default status
affected

Any version
affected

Credits

ashdfrkl finder

References

github.com/...ium/tree/main/rustdesk-session-permission-pocs (Proof of Concept) exploit third-party-advisory

www.vulncheck.com/...sfer-session-authorization-scope-bypass (VulnCheck Advisory: RustDesk - FileTransfer Session Authorization Scope Bypass) third-party-advisory

cve.org (CVE-2026-58056)

nvd.nist.gov (CVE-2026-58056)

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