{"id":"CVE-2026-30796","summary":"RustDesk Client Transmits Preset Address Book Password Verbatim in Heartbeat Sync","details":"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.\n\nThe 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.\n\nThis vulnerability is associated with program files src/hbbs_http/sync.rs and program routines heartbeat sync body builder (emits preset-address-book-password).\n\nThis issue affects RustDesk Client: through 1.4.8.","modified":"2026-08-12T03:51:17.859986327Z","published":"2026-03-05T15:30:39.605Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30796.json","cna_assigner":"VULSec","cwe_ids":["CWE-522"]},"references":[{"type":"WEB","url":"https://github.com/rustdesk/rustdesk,https://github.com/rustdesk/hbb_common"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30796.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30796"},{"type":"ADVISORY","url":"https://www.vulsec.org/"},{"type":"PACKAGE","url":"https://github.com/rustdesk/rustdesk/releases"},{"type":"ARTICLE","url":"https://rustdesk.com/docs/en/"},{"type":"EVIDENCE","url":"https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rustdesk/rustdesk","events":[{"introduced":"0"},{"last_affected":"9ded8d6ab24779db3c9334f5a3d6a652b8425c4f"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"1.4.8"}]}}],"versions":["1.4.8","1.4.7","1.4.6","nightly","1.4.5","1.4.4","1.4.3","1.4.2","1.4.1","1.4.0","1.3.9","1.3.8","1.3.7","1.3.6","1.3.5","1.3.4","1.3.3","1.3.2","1.3.1","1.3.0","1.2.7","1.2.6","1.2.5","fdroid-version","1.2.4","1.2.3-2","1.2.3-1","1.2.3","1.2.2","1.2.1","1.2.0","1.1.9","1.1.8","1.1.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30796.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N"}]}