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CVE-2026-58056: RustDesk - FileTransfer Session Authorization Scope Bypass

• Severity: high (CVSS 7.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-28 · updated 2026-10-25
• Weakness: CWE-863

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.

Affected products

• rustdesk-client RustDesk Client: through 1.4.8

References

• https://github.com/bikini/exploitarium/tree/main/rustdesk-session-permission-pocs
• https://www.vulncheck.com/advisories/rustdesk-filetransfer-session-authorization-scope-bypass

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