CVE-2026-30796
RustDesk Client Transmits Preset Address Book Password Verbatim in Heartbeat Sync
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 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.
INFO
Published Date :
March 5, 2026, 4:16 p.m.
Last Modified :
July 19, 2026, 12:16 p.m.
Remotely Exploit :
Yes !
Source :
2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Affected Products
The following products are affected by CVE-2026-30796
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 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 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 Server Pro to the latest version.
- Ensure sensitive data is transmitted over encrypted channels.
- Configure the address book sync API securely.
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-2026-30796.
| 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/ | Product Vendor Advisory |
| 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-2026-30796 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-2026-30796
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-2026-30796 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-30796 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
Jul. 19, 2026
Action Type Old Value New Value Changed 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. 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 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. -
CVE Modified by 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Jun. 22, 2026
Action Type Old Value New Value Removed CWE CWE-319 -
CVE Modified by 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Jun. 22, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'rustdesk-server-pro', 'modules': ['Address book sync API'], 'product': 'RustDesk Server Pro', 'versions': [{'status': 'affected', 'changes': [{'at': 'Server Pro', 'status': 'affected'}], 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.7.5'}], 'platforms': ['Windows', 'MacOS', 'Linux'], 'packageName': 'rustdesk-server-pro', 'programFiles': ['Closed source — API endpoint handling heartbeat sync'], 'collectionURL': 'https://github.com/rustdesk/rustdesk-server-pro/releases', 'defaultStatus': 'affected', 'programRoutines': [{'name': 'Heartbeat API handler (accepts preset-address-book-password in plaintext)'}]}] [{'repo': 'https://github.com/rustdesk/rustdesk,https://github.com/rustdesk/hbb_common', 'vendor': 'rustdesk-client', 'modules': ['Address book sync', 'Heartbeat sync loop'], 'product': 'RustDesk Client', 'versions': [{'status': 'affected', 'changes': [{'at': 'Server Pro', 'status': 'affected'}], 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.4.8'}], 'platforms': ['Windows', 'MacOS', 'Linux', 'iOS', 'Android'], 'packageName': 'rustdesk-client', 'programFiles': ['src/hbbs_http/sync.rs'], 'collectionURL': 'https://github.com/rustdesk/rustdesk/releases', 'defaultStatus': 'affected', 'programRoutines': [{'name': 'heartbeat sync body builder (emits preset-address-book-password verbatim)'}]}] Changed Description Cleartext Transmission of Sensitive Information vulnerability in rustdesk-server-pro RustDesk Server Pro rustdesk-server-pro on Windows, MacOS, Linux (Address book sync API modules) allows Sniffing Attacks. This vulnerability is associated with program files Closed source — API endpoint handling heartbeat sync and program routines Heartbeat API handler (accepts preset-address-book-password in plaintext). This issue affects RustDesk Server Pro: through 1.7.5. 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/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: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 Added CWE CWE-522 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-30796', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-03-17T14:31:35.721954Z'} -
CVE Modified by 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'rustdesk-server-pro', 'modules': ['Address book sync API'], 'product': 'RustDesk Server Pro', 'versions': [{'status': 'affected', 'changes': [{'at': 'Server Pro', 'status': 'affected'}], 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.7.5'}], 'platforms': ['Windows', 'MacOS', 'Linux'], 'packageName': 'rustdesk-server-pro', 'programFiles': ['Closed source — API endpoint handling heartbeat sync'], 'collectionURL': 'https://github.com/rustdesk/rustdesk-server-pro/releases', 'defaultStatus': 'affected', 'programRoutines': [{'name': 'Heartbeat API handler (accepts preset-address-book-password in plaintext)'}]}] -
Reanalysis by [email protected]
Mar. 25, 2026
Action Type Old Value New Value Changed CPE Configuration AND OR *cpe:2.3:a:rustdesk:rustdesk:*:*:*:*:webclient:*:*:* versions up to (including) 1.4.5 *cpe:2.3:a:rustdesk:rustdesk_server:*:*:*:*:pro:*:*:* versions up to (including) 1.7.5 OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* AND OR *cpe:2.3:a:rustdesk:rustdesk_server:*:*:*:*:pro:*:*:* versions up to (including) 1.7.5 OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* -
Reanalysis by [email protected]
Mar. 25, 2026
Action Type Old Value New Value Changed Reference Type VULSec Labs: https://www.vulsec.org/ Types: Product VULSec Labs: https://www.vulsec.org/ Types: Not Applicable -
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:N/A:N Added CPE Configuration AND OR *cpe:2.3:a:rustdesk:rustdesk:*:*:*:*:webclient:*:*:* versions up to (including) 1.4.5 *cpe:2.3:a:rustdesk:rustdesk_server:*:*:*:*:pro:*:*:* versions up to (including) 1.7.5 OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* 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/ Types: Product, Vendor Advisory Added Reference Type VULSec Labs: https://www.vulsec.org/ Types: Product -
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 Cleartext Transmission of Sensitive Information vulnerability in rustdesk-server-pro RustDesk Server Pro rustdesk-server-pro on Windows, MacOS, Linux (Address book sync API modules) allows Sniffing Attacks. This vulnerability is associated with program files Closed source — API endpoint handling heartbeat sync and program routines Heartbeat API handler (accepts preset-address-book-password in plaintext). This issue affects RustDesk Server Pro: through 1.7.5. Added CVSS V4.0 AV:N/AC:L/AT:N/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 Added CWE CWE-319 Added Reference https://rustdesk.com/docs/en/