CVE-2026-30789Public exploit

Offline password recovery via fast SHA-256 proof

Published Mar 5, 2026 · Updated Mar 5, 2026

Password cracking in RustDesk Client 1.4.8 and earlier allows local users to recover weak passwords from captured authentication proofs. The login proof construction in src/client.rs computes SHA256(SHA256(password + salt) + challenge) without a slow KDF or client nonce. Exploitation requires a stored verifier or captured proof; per-connection challenges prevent replay, and only the password is exposed.

CVSS severity5.7
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Password cracking in RustDesk Client 1.4.8 and earlier allows local users to recover weak passwords from captured authentication proofs. The login proof construction in src/client.rs computes SHA256(SHA256(password + salt) + challenge) without a slow KDF or client nonce. Exploitation requires a stored verifier or captured proof; per-connection challenges prevent replay, and only the password is exposed.

The record

CVE
CVE-2026-30789
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
RustDesk
Product
RustDesk
Classifications
CWE-916, T1110.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.4.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

RustDesk · RustDeskversion=0 <=1.4.5

Published CVSS scores

5.7VULSec LabsCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-916Use of Password Hash With Insufficient Computational Effort
T1110.002Password Cracking

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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