{"cve":"CVE-2026-73054","nvd":{"published":"2026-08-15T22:16:55.290","modified":"2026-08-26T17:05:08.273","status":"Deferred","description":"SiYuan versions before v3.7.4 contain an authentication bypass vulnerability in the WebSocket endpoint caused by differential parsing of query parameters between authentication exemption and session quarantine checks. Unauthenticated attackers can craft a malicious WebSocket URI with duplicated query parameters to bypass access auth code validation and receive the live kernel event stream including document identifiers, titles, and operation logs.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-287"],"references":["https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c8w8-3pqp-wr83","https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-websocket","https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c8w8-3pqp-wr83"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:10.689564601+00:00"},"epss":{"cve":"CVE-2026-73054","score":0.00408,"percentile":0.35082,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-c8w8-3pqp-wr83","url":"https://osv.dev/vulnerability/GHSA-c8w8-3pqp-wr83","summary":"SiYuan: A parser differential between the WebSocket keepalive exemption and the session quarantine allows unauthenticated access to the broadcast event stream","modified":"2026-10-23T18:45:09.519798674Z","packages":[{"ecosystem":"Go","name":"github.com/siyuan-note/siyuan/kernel","purl":"pkg:golang/github.com/siyuan-note/siyuan/kernel","ranges":["<0.0.0-20260731131820-67bc300b6ea6"],"fixed":["0.0.0-20260731131820-67bc300b6ea6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}