{"id":"CVE-2026-100634","revision":"35adbdf146ea410883c26cbfdf8a50b1","records":[{"revision":"35adbdf146ea410883c26cbfdf8a50b1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-100634","aliases":[],"title":"SiYuan before v3.8.4 Missing Authorization via siyuan-send-windows","description":"SiYuan before v3.8.4 does not validate the sender or restrict recipients in the 'siyuan-send-windows' IPC handler of the Electron main process (app/electron/main.js). The handler ignores event.sender and forwards any received payload to every BrowserWindow returned by BrowserWindow.getAllWindows(), including windows belonging to other opened workspaces. A renderer connected to an attacker-controlled remote kernel can therefore send {cmd: \"lockscreenByMode\"} and have it delivered across the workspace boundary; a sibling workspace window whose lockScreenMode is set to 1 invokes lockScreen(). Repeated messages allow the remote workspace to repeatedly lock unrelated local workspace windows, causing a limited denial of service. No confidentiality, integrity, or code-execution impact was observed.","state":0,"publishedAt":"2026-09-26T13:23:09.166+00:00","modifiedAt":"2026-10-08T15:51:25.36+00:00","affected":[{"ecosystem":"Vendor product","name":"siyuan","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"siyuan-note\",\n                    \"product\": \"siyuan\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:golang/github.com/siyuan-note/siyuan/kernel\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"3.8.4\"\n                        },\n                        {\n                            \"version\": \"3.8.4\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L","score":5.3,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L","score":4.7,"severity":"MEDIUM"}],"references":["https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wxp7-xpq8-8xpm","https://github.com/siyuan-note/siyuan/commit/8641553a1f07374001902d3ce773285db1292b2d","https://www.vulncheck.com/advisories/siyuan-before-3.8.4-missing-authorization-via-siyuan-send-windows"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-100634","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-100634","identifiers":["CVE-2026-100634"]},"retained":false,"historicalAffected":[]}],"coverage":[]}