Is CVE-2026-30789 actively exploited?

No active exploitation of CVE-2026-30789 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-30789 be exploited remotely?

Yes. CVE-2026-30789 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-30789?

CVE-2026-30789 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2026-30789

CRITICAL

CVE-2026-30789

CWE-294Published: March 5, 2026· Updated: Jun 22, 2026

9.8

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:17.2th

Official 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 The capture-replay claim (CWE-294) is withdrawn: the challenge is regenerated per connection (challenge = Config::get_auto_password(6)), so a captured proof is not replayable against the legitimate server.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.

NVD Source

Risk Analysis

This critical vulnerability in RustDesk Client allows for session replay attacks due to authentication bypass via capture-replay and insufficient computational effort in password hash usage. With a CVSS score of 9.3, this flaw poses a severe risk of unauthorized access by replaying valid session IDs. The lack of an EPSS score means its exploitation likelihood is currently unknown, but the high CVSS score indicates urgency.

No public exploit is currently known for this vulnerability. Its remote exploitability (AV:N) and low attack complexity (AC:L) mean it could be exploited without extensive effort if an exploit becomes available.

Recommended Action

To mitigate this vulnerability, ensure all RustDesk Client installations are updated to a version beyond 1.4.5. Implement measures to invalidate session IDs after logout or a period of inactivity to prevent replay attacks.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-30789 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.