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CVE-2026-30789— RustDesk Auth Proof Uses Server-Controlled Salt/Challenge and Fast Double-SHA256, Enabling Offline Brute-Force

Quick assessment

Affected
rustdesk-client RustDesk Client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RustDesk是RustDesk个人开发者的一款远程访问和远程控制软件，主要由 Rust 编写，可以远程维护计算机和其他设备。 RustDesk 1.4.5及之前版本存在安全漏洞，该漏洞源于身份验证重放绕过和密码哈希计算强度不足，可能导致重用会话ID。

AI Predicted 8.1 Difficulty: Easy EPSS 0.34% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustdesk-client RustDesk Client ≤ 1.4.8 affected
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I. Basic Information for CVE-2026-30789

Vulnerability Information
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Vulnerability Title
RustDesk Auth Proof Uses Server-Controlled Salt/Challenge and Fast Double-SHA256, Enabling Offline Brute-Force
Source: CVE Program / CVE List V5
Vulnerability Description
Use of Password Hash With Insufficient Computational Effort, Improper Restriction of Excessive Authentication Attempts vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Client login, peer authentication modules) allows Password Brute Forcing. The authentication proof is SHA256(SHA256(password + salt) + challenge), where both the salt and the challenge are generated entirely by the server with no client-side nonce, and the hash uses no slow key-derivation function. A rogue or on-path API/relay server (see CVE-2026-30794 / CVE-2026-30797) can issue a chosen salt and challenge, capture the resulting proof, and recover the password offline. The capture-replay claim (CWE-294) is withdrawn: the challenge is regenerated per connection (challenge = Config::get_auto_password(6)), so a captured proof is not replayable against the legitimate server. The 1.4.7 OTP brute-force limiter and the existing LOGIN_FAILURES counter constrain only ONLINE attempts and do not address offline recovery. This vulnerability is associated with program files src/client.rs and program routines handle_hash(), handle_login_from_ui() (login proof construction). This issue affects RustDesk Client: through 1.4.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用具有不充分计算复杂性的口令哈希
Source: CVE Program / CVE List V5
Vulnerability Title
RustDesk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RustDesk是RustDesk个人开发者的一款远程访问和远程控制软件，主要由 Rust 编写，可以远程维护计算机和其他设备。 RustDesk 1.4.5及之前版本存在安全漏洞，该漏洞源于身份验证重放绕过和密码哈希计算强度不足，可能导致重用会话ID。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rustdesk-client RustDesk Client 0 ~ 1.4.8 -

II. Public POCs for CVE-2026-30789

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III. Intelligence Information for CVE-2026-30789

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Proof of Concept for CVE-2026-30789 (1)

Security Blog Posts for CVE-2026-30789 (1)

Vendor Pages for CVE-2026-30789 (1)

Same Patch Batch · rustdesk-client · 2026-03-05 · 10 CVEs total

CVE-2026-30791 RustDesk Client Accepts Pseudo-Encrypted Config Strings Without Cryptographic Validation
CVE-2026-30797 RustDesk rustdesk://config/ URI Silently Re-homes Client to Attacker-Controlled Server
CVE-2026-30798 RustDesk Client Accepts Unauthenticated stop-service Command via Strategy Payload
CVE-2026-30793 RustDesk Flutter URI Handler Sets Permanent Password Without Privilege Check or User Confi
CVE-2026-30796 RustDesk Client Transmits Preset Address Book Password Verbatim in Heartbeat Sync
CVE-2026-30792 RustDesk Client Blindly Merges Unauthenticated Strategy Payloads, Bypassing Local Security
CVE-2026-30795 RustDesk HTTP Client Silently Accepts Invalid TLS Certificates After Handshake Failure
CVE-2026-30785 RustDesk Encrypts Local Passwords with World-Readable Machine ID and Fixed Zero Nonce (XSa
CVE-2026-30783 RustDesk Client Can Orphan API Channel to Ignore All Admin Commands and ACL Policies

IV. Related Vulnerabilities

Same product: RustDesk Client
Same vendor: rustdesk-client
Same weakness: CWE-916

V. Comments for CVE-2026-30789

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