CVE-2026-30789 PUBLISHED

RustDesk Client Generates Auth Proof Without Client-Side Nonce, Enabling Replay Attacks

Assigner: VULSec
Reserved: 05.03.2026 Published: 05.03.2026 Updated: 05.03.2026

Authentication Bypass by Capture-replay, Use of Password Hash With Insufficient Computational Effort vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Client login, peer authentication modules) allows Reusing Session IDs (aka Session Replay). This vulnerability is associated with program files src/client.Rs and program routines hash_password(), login proof construction.

This issue affects RustDesk Client: through 1.4.5.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	rustdesk-client
Product	RustDesk Client
Versions	Default: affected affected from 0 to 1.4.5 (incl.)

Affected Configurations

Default — any password-based authentication

Exploits

PoC available.

Workarounds

Use long (16+ char) random passwords. Enable 2FA where available.

Solutions

Add client-side nonce to auth proof. Implement SRP.

Credits

Erez Kalman finder
Erez Kalman reporter

References

https://rustdesk.com/docs/en/client/

Problem Types

CWE-294 Authentication Bypass by Capture-replay CWE
CWE-916 Use of Password Hash With Insufficient Computational Effort CWE

Impacts

CAPEC-60 Reusing Session IDs (aka Session Replay)