{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-30789",
"assignerOrgId": "2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe",
"state": "PUBLISHED",
"assignerShortName": "VULSec",
"dateReserved": "2026-03-05T14:13:37.202Z",
"datePublished": "2026-03-05T15:41:51.417Z",
"dateUpdated": "2026-06-22T13:16:30.794Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe",
"shortName": "VULSec",
"dateUpdated": "2026-06-22T13:16:30.794Z"
},
"title": "RustDesk Auth Proof Uses Server-Controlled Salt/Challenge and Fast Double-SHA256, Enabling Offline Brute-Force",
"datePublic": "2026-03-05T13:45:00.000Z",
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"cweId": "CWE-916",
"description": "CWE-916 Use of Password Hash With Insufficient Computational Effort",
"type": "CWE"
}
]
}
],
"impacts": [
{
"capecId": "CAPEC-49",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-49 Password Brute Forcing"
}
]
}
],
"affected": [
{
"vendor": "rustdesk-client",
"product": "RustDesk Client",
"platforms": [
"Windows",
"MacOS",
"Linux",
"iOS",
"Android"
],
"collectionURL": "https://github.com/rustdesk/rustdesk/releases",
"packageName": "rustdesk-client",
"repo": "https://github.com/rustdesk/rustdesk,https://github.com/rustdesk/hbb_common",
"modules": [
"Client login",
"peer authentication"
],
"programFiles": [
"src/client.rs"
],
"programRoutines": [
{
"name": "handle_hash()"
},
{
"name": "handle_login_from_ui() (login proof construction)"
}
],
"versions": [
{
"status": "affected",
"version": "0",
"lessThanOrEqual": "1.4.8",
"versionType": "custom"
}
],
"defaultStatus": "affected"
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:rustdesk-client:rustdesk_client:*:*:windows:*:*:*:*:*",
"versionEndIncluding": "1.4.8",
"versionStartIncluding": "0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:rustdesk-client:rustdesk_client:*:*:macos:*:*:*:*:*",
"versionEndIncluding": "1.4.8",
"versionStartIncluding": "0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:rustdesk-client:rustdesk_client:*:*:linux:*:*:*:*:*",
"versionEndIncluding": "1.4.8",
"versionStartIncluding": "0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:rustdesk-client:rustdesk_client:*:*:ios:*:*:*:*:*",
"versionEndIncluding": "1.4.8",
"versionStartIncluding": "0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:rustdesk-client:rustdesk_client:*:*:android:*:*:*:*:*",
"versionEndIncluding": "1.4.8",
"versionStartIncluding": "0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"descriptions": [
{
"lang": "en",
"value": "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.\n\nThe 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.\n\nThis vulnerability is associated with program files src/client.rs and program routines handle_hash(), handle_login_from_ui() (login proof construction).\n\nThis issue affects RustDesk Client: through 1.4.8.",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "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."
}
]
}
],
"references": [
{
"url": "https://rustdesk.com/docs/en/client/",
"tags": [
"technical-description",
"x_--config documentation"
]
},
{
"url": "https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub",
"tags": [
"third-party-advisory",
"exploit"
]
},
{
"url": "https://www.vulsec.org/",
"tags": [
"vdb-entry",
"third-party-advisory"
]
}
],
"metrics": [
{
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
],
"cvssV4_0": {
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"subIntegrityImpact": "NONE",
"vulnAvailabilityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED",
"version": "4.0",
"baseSeverity": "MEDIUM",
"baseScore": 5.7,
"vectorString": "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"
}
}
],
"configurations": [
{
"lang": "en",
"value": "Default — any password-based authentication",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "Default — any password-based authentication"
}
]
}
],
"workarounds": [
{
"lang": "en",
"value": "Use long (16+ char) random passwords. Enable 2FA where available.",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "Use long (16+ char) random passwords. Enable 2FA where available."
}
]
}
],
"solutions": [
{
"lang": "en",
"value": "Add a client-side nonce to the auth proof and use a slow KDF (e.g., Argon2id). Transition to SRP.",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "Add a client-side nonce to the auth proof and use a slow KDF (e.g., Argon2id). Transition to SRP."
}
]
}
],
"exploits": [
{
"lang": "en",
"value": "PoC available.",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "PoC available.
"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Erez Kalman",
"type": "finder"
},
{
"lang": "en",
"value": "Erez Kalman",
"type": "reporter"
}
],
"source": {
"discovery": "UNKNOWN"
},
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-03-17T14:32:41.844771Z",
"id": "CVE-2026-30789",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-03-17T14:32:45.784Z"
}
}
]
}
}