CVE-2026-30796
Received Received - Intake

Cleartext Transmission in RustDesk Server Pro Enables Data Sniffing

Publication date: 2026-03-05

Last updated on: 2026-06-22

Assigner: VULSec Labs

Description
Cleartext Transmission of Sensitive Information, Insufficiently Protected Credentials vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Address book sync, Heartbeat sync loop modules) allows Sniffing Attacks. The client places the preset address-book password verbatim into the heartbeat sync JSON body (src/hbbs_http/sync.rs). Over an intact HTTPS session it is not exposed in transit, but it is a reusable shared secret rather than a zero-knowledge proof, so it is recovered by any party that becomes the API endpoint - under the automatic invalid-certificate TLS downgrade (CVE-2026-30794) or a re-homed/rogue API server (CVE-2026-30797) - and the leaked credential then authorizes the server-side address book. This vulnerability is associated with program files src/hbbs_http/sync.rs and program routines heartbeat sync body builder (emits preset-address-book-password). This issue affects RustDesk Client: through 1.4.8.

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Meta Information

Published
2026-03-05
Last Modified
2026-06-22
Generated
2026-07-06
AI Q&A
2026-03-05
EPSS Evaluated
2026-07-05
NVD
CVE-2026-30796
EUVD
EUVD-2026-9836

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
rustdesk rustdesk_server to 1.7.5 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-319 The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.
CWE-522 The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.

Attack-Flow Graph

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Executive Summary

This vulnerability is a Cleartext Transmission of Sensitive Information issue found in rustdesk-server-pro, specifically in the RustDesk Server Pro software on Windows, MacOS, and Linux platforms. It affects the Address book sync API modules, where sensitive information such as the preset-address-book-password is transmitted in plaintext through the Heartbeat API handler. This allows attackers to perform sniffing attacks by intercepting this unencrypted sensitive data during transmission.

Impact Analysis

The impact of this vulnerability is that an attacker who can intercept network traffic between the client and the RustDesk Server Pro can capture sensitive information like passwords transmitted in cleartext. This can lead to unauthorized access to address book data or other sensitive resources managed by the server, potentially compromising user privacy and security.

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