CVE-2026-30789 (GCVE-0-2026-30789)

Vulnerability from cvelistv5 – Published: 2026-03-05 15:41 – Updated: 2026-06-22 13:16
VLAI
Title
RustDesk Auth Proof Uses Server-Controlled Salt/Challenge and Fast Double-SHA256, Enabling Offline Brute-Force
Summary
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 The capture-replay claim (CWE-294) is withdrawn: the challenge is regenerated per connection (challenge = Config::get_auto_password(6)), so a captured proof is not replayable against the legitimate server.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.
Severity
5.7 (Medium)
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
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-916 - Use of Password Hash With Insufficient Computational Effort
Assigner
References
URL Tags
https://rustdesk.com/docs/en/client/ technical-descriptionx_--config documentation
https://docs.google.com/document/d/e/2PACX-1vSds6… third-party-advisoryexploit
https://www.vulsec.org/ vdb-entrythird-party-advisory
Impacted products
Vendor Product Version
rustdesk-client RustDesk Client Affected: 0 , ≤ 1.4.8 (custom)
Create a notification for this product.
Date Public
2026-03-05 13:45
Credits
Erez Kalman Erez Kalman
Show details on NVD website
To clipboard 

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      "cveMetadata": "{\"cveId\": \"CVE-2026-30789\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-22T13:16:30.794Z\", \"dateReserved\": \"2026-03-05T14:13:37.202Z\", \"assignerOrgId\": \"2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe\", \"datePublished\": \"2026-03-05T15:41:51.417Z\", \"assignerShortName\": \"VULSec\"}",
      "dataType": "CVE_RECORD",
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  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.