{"schemaVersion":3,"id":"CVE-2026-32940","aliases":["GHSA-4mx9-3c2h-hwhg","GO-2026-4721"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-03-20T03:33:43.069Z","modified":"2026-03-20T19:53:35.414Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.3,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Go","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","exploitability":7.2,"impact":9.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.1,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00476,"percentile":0.39797,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.17400000000000002,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00302},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00476,"percentile":0.39797}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00302,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00458,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00476,"percentile":0.39797}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"GITHUB_SIYUAN-NOTE_SIYUAN","name":"Siyuan","source":"github","url":"https://github.com/siyuan-note/siyuan/issues/11949","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"GITHUB_ADVISORIES_GHSA-6865-QJCF-286F","name":"Ghsa 6865 Qjcf 286F","source":"github","url":"https://github.com/advisories/GHSA-6865-qjcf-286f","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":2,"weaknesses":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","description":"The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/79.html"},{"id":"CWE-184","name":"Incomplete List of Disallowed Inputs","description":"The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/184.html"}],"affected":[{"vendor":"b3log","product":"siyuan","name":"siyuan","label":"siyuan","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 3.6.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.1","eol":null,"hubHref":"/vendor/b3log/siyuan"},{"vendor":"github.com/siyuan-note","product":"siyuan","name":"github.com/siyuan-note/siyuan","label":"siyuan","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/siyuan-note/siyuan","purlType":"golang","versions":[{"text":"≤ 0.0.0-20260313024916-fd6526133bb3","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"≤ 0.0.0-20260313024916-fd6526133bb3 | All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"siyuan-note","product":"siyuan","name":"siyuan","label":"siyuan","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 3.6.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.1","eol":null,"hubHref":"/vendor/siyuan-note/siyuan"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4mx9-3c2h-hwhg","label":"github.com/siyuan-note/siyuan/security/advisories/GHSA-4mx9-3c2h-hwhg","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Advisory","Exploit","Mitigation","Vendor Advisory"]},{"url":"https://github.com/siyuan-note/siyuan/commit/d01d561875d4f744e9f6232f1d4831e3642b8696","label":"github.com/siyuan-note/siyuan/commit/d01d561875d4f744e9f6232f1d4831e3642b8696","hostname":"github.com","tags":["X Refsource MISC","WEB","FIX","Patch"]},{"url":"https://github.com/advisories/GHSA-6865-qjcf-286f","label":"github.com/advisories/GHSA-6865-qjcf-286f","hostname":"github.com","tags":["X Refsource MISC","Advisory","WEB","Exploit","Third Party Advisory"]},{"url":"https://github.com/siyuan-note/siyuan/releases/tag/v3.6.1","label":"github.com/siyuan-note/siyuan/releases/tag/v3.6.1","hostname":"github.com","tags":["X Refsource MISC","WEB","Release Notes"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32940","label":"nvd.nist.gov/vuln/detail/CVE-2026-32940","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/siyuan-note/siyuan","label":"github.com/siyuan-note/siyuan","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:21483-1","SUSE-SU-2026:1135-1"],"duplicates":[],"related":["CVE-2026-29183","OPENSUSE-SU-2026:21483-1","SUSE-SU-2026:1135-1"]},"timeline":[{"kind":"published","date":"2026-03-20T03:33:43.069Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-03-20T19:53:35.414Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T08:28:24.363Z","stale":false,"partial":false}}