{"id":"CVE-2026-32940","aliases":["GHSA-4mx9-3c2h-hwhg","GO-2026-4721"],"url":"https://o3.security/vulnerability/CVE-2026-32940","summary":"SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)","details":"SiYuan is a personal knowledge management system. In versions 3.6.0 and below, SanitizeSVG has an incomplete blocklist — it blocks data:text/html and data:image/svg+xml in href attributes but misses data:text/xml and data:application/xml, both of which can render SVG with JavaScript execution. The unauthenticated /api/icon/getDynamicIcon endpoint serves user-controlled input (via the content parameter) directly into SVG markup using fmt.Sprintf with no escaping, served as Content-Type: image/svg+xml. This creates a click-through XSS: a victim navigates to a crafted URL, sees an SVG with an injected link, and clicking it triggers JavaScript via the bypassed MIME types. The attack requires direct navigation to the endpoint or <object>/<embed> embedding, since <img> tag rendering in the frontend doesn't allow interactive links. This issue has been fixed in version 3.6.1.","published":"2026-03-20T03:33:43.069Z","modified":"2026-08-07T11:48:53.688556367Z","cvss":{"score":9.3,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/siyuan-note/siyuan","fixedVersion":null}],"fix":{"url":"https://github.com/siyuan-note/siyuan/commit/d01d561875d4f744e9f6232f1d4831e3642b8696","label":"siyuan-note/siyuan@d01d561"},"references":[{"type":"WEB","url":"https://github.com/siyuan-note/siyuan/releases/tag/v3.6.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32940.json"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-6865-qjcf-286f"},{"type":"ADVISORY","url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4mx9-3c2h-hwhg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32940"},{"type":"FIX","url":"https://github.com/siyuan-note/siyuan/commit/d01d561875d4f744e9f6232f1d4831e3642b8696"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:48:53.688556367Z"}}