{"id":"CVE-2026-75916","revision":"3459f24b7192492d9c270e341f3c88c8","records":[{"revision":"3459f24b7192492d9c270e341f3c88c8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-75916","aliases":[],"title":"SiYuan XSS-to-RCE via unescaped block metadata in hint popup","description":"SiYuan through 3.7.3 contains a cross-site scripting vulnerability in the '((' block-reference autocomplete hint popup. In genHintItemHTML() (app/src/protyle/hint/extend.ts), a candidate block's name, alias, and memo fields are concatenated into the popup's HTML without escaping. An attacker who can set these metadata fields on a block can inject a self-firing payload (e.g. <img src=x onerror=...>) that executes automatically when a victim types '((' followed by a search term that surfaces the crafted block. Because SiYuan's Electron windows run with nodeIntegration enabled, contextIsolation disabled, and no CSP, the injected script gains require('child_process') access, allowing the XSS to escalate to arbitrary OS command execution.","state":0,"publishedAt":"2026-08-19T14:01:50.37+00:00","modifiedAt":"2026-10-08T15:51:43.765+00:00","affected":[{"ecosystem":"Vendor product","name":"siyuan","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"siyuan-note\",\n                    \"product\": \"siyuan\",\n                    \"defaultStatus\": \"affected\",\n                    \"packageURL\": \"pkg:golang/github.com/siyuan-note/siyuan/kernel\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","score":9.3,"severity":"CRITICAL"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","score":8.6,"severity":"HIGH"}],"references":["https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5prr-vgxq-69g9","https://www.vulncheck.com/advisories/siyuan-xss-to-rce-via-unescaped-block-metadata-in-hint-popup"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-75916","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-75916","identifiers":["CVE-2026-75916"]},"retained":false,"historicalAffected":[]}],"coverage":[]}