CVE-2026-30789
RustDesk Auth Proof Uses Server-Controlled Salt/Challenge and Fast Double-SHA256, Enabling Offline Brute-Force
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 The capture-replay claim (CWE-294) is withdrawn: the challenge is regenerated per connection (challenge = Config::get_auto_password(6)), so a captured proof is not replayable against the legitimate server.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.
INFO
Published Date :
March 5, 2026, 4:16 p.m.
Last Modified :
June 22, 2026, 2:16 p.m.
Remotely Exploit :
Yes !
Source :
2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Affected Products
The following products are affected by CVE-2026-30789
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe | ||||
| CVSS 4.0 | CRITICAL | 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe | ||||
| CVSS 4.0 | HIGH | 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe | ||||
| CVSS 4.0 | MEDIUM | 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe |
Solution
- Update RustDesk Client to the latest version.
- Apply provided patches for affected modules.
- Review and strengthen session authentication mechanisms.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-30789.
| URL | Resource |
|---|---|
| https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub | Exploit Third Party Advisory |
| https://rustdesk.com/docs/en/client/ | Product |
| https://www.vulsec.org/ | Not Applicable |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-30789 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-30789
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-30789 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-30789 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Jun. 22, 2026
Action Type Old Value New Value Added CVSS V4.0 AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Removed CVSS V4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Removed CWE CWE-307 -
CVE Modified by 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Jun. 22, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/rustdesk/rustdesk,https://github.com/rustdesk/hbb_common', 'vendor': 'rustdesk-client', 'modules': ['Client login', 'peer authentication'], 'product': 'RustDesk Client', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.4.5'}], 'platforms': ['Windows', 'MacOS', 'Linux', 'iOS', 'Android'], 'packageName': 'rustdesk-client', 'programFiles': ['src/client.rs'], 'collectionURL': 'https://github.com/rustdesk/rustdesk/releases', 'defaultStatus': 'affected', 'programRoutines': [{'name': 'hash_password()'}, {'name': 'login proof construction'}]}] [{'repo': 'https://github.com/rustdesk/rustdesk,https://github.com/rustdesk/hbb_common', 'vendor': 'rustdesk-client', 'modules': ['Client login', 'peer authentication'], 'product': 'RustDesk Client', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.4.8'}], 'platforms': ['Windows', 'MacOS', 'Linux', 'iOS', 'Android'], 'packageName': 'rustdesk-client', 'programFiles': ['src/client.rs'], 'collectionURL': 'https://github.com/rustdesk/rustdesk/releases', 'defaultStatus': 'affected', 'programRoutines': [{'name': 'handle_hash()'}, {'name': 'handle_login_from_ui() (login proof construction)'}]}] Changed Description 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. 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. Added CVSS V4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Removed CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-307 -
CVE Modified by 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Jun. 22, 2026
Action Type Old Value New Value Changed Description 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. 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. Removed CWE CWE-294 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-30789', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-03-17T14:32:41.844771Z'} -
CVE Modified by 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/rustdesk/rustdesk,https://github.com/rustdesk/hbb_common', 'vendor': 'rustdesk-client', 'modules': ['Client login', 'peer authentication'], 'product': 'RustDesk Client', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.4.5'}], 'platforms': ['Windows', 'MacOS', 'Linux', 'iOS', 'Android'], 'packageName': 'rustdesk-client', 'programFiles': ['src/client.rs'], 'collectionURL': 'https://github.com/rustdesk/rustdesk/releases', 'defaultStatus': 'affected', 'programRoutines': [{'name': 'hash_password()'}, {'name': 'login proof construction'}]}] -
Initial Analysis by [email protected]
Mar. 25, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration AND OR *cpe:2.3:a:rustdesk:rustdesk:*:*:*:*:webclient:*:*:* versions up to (including) 1.4.5 OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* cpe:2.3:o:apple:iphone_os:-:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* cpe:2.3:o:google:android:-:*:*:*:*:*:*:* cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* Added Reference Type VULSec Labs: https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub Types: Exploit, Third Party Advisory Added Reference Type VULSec Labs: https://rustdesk.com/docs/en/client/ Types: Product Added Reference Type VULSec Labs: https://www.vulsec.org/ Types: Not Applicable -
CVE Modified by 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Mar. 05, 2026
Action Type Old Value New Value Added Reference https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub Added Reference https://www.vulsec.org/ -
New CVE Received by 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Mar. 05, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-294 Added CWE CWE-916 Added Reference https://rustdesk.com/docs/en/client/