Authentication Bypass in RustDesk Client Across Multiple Platforms
CVE-2026-30789

9.3CRITICAL

Key Information:

Vendor

Rustdesk-client

Status
Rustdesk Client
Vendor
CVE Published:
5 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-30789?

The RustDesk Client suffers from an authentication bypass vulnerability that allows attackers to reuse session IDs, enabling unauthorized access to user sessions. This issue affects all platforms including Windows, MacOS, Linux, iOS, and Android, and is tied to weaknesses in the peer authentication and client login modules. Specifically, vulnerabilities in the hash_password() routine and session proof construction can be exploited to bypass authentication mechanisms, increasing the risk of session hijacking.

Affected Version(s)

RustDesk Client Windows 0 <= 1.4.5

References

https://rustdesk.com/docs/en/client/
technical-descriptionx_--config documentation
https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO...
third-party-advisoryexploit
https://www.vulsec.org/
vdb-entrythird-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Erez Kalman
Erez Kalman
.