{"id":"CVE-2026-23645","state":"PUBLISHED","title":"SiYuan Vulnerable to Stored Cross-Site Scripting (XSS) via Unrestricted SVG File Upload","description":"SiYuan is self-hosted, open source personal knowledge management software. Prior to 3.5.4-dev2, a Stored Cross-Site Scripting (XSS) vulnerability exists in SiYuan Note. The application does not sanitize uploaded SVG files. If a user uploads and views a malicious SVG file (e.g., imported from an untrusted source), arbitrary JavaScript code is executed in the context of their authenticated session. This vulnerability is fixed in 3.5.4-dev2.","publishedAt":"2026-01-16T19:20:06.744Z","updatedAt":"2026-01-16T21:37:58.336Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["siyuan-note siyuan"],"affected":[{"vendor":"siyuan-note","product":"siyuan","versions":[{"version":"< 3.5.4-dev2","status":"affected"}]}],"references":["https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pcjq-j3mq-jv5j","https://github.com/siyuan-note/siyuan/issues/16844","https://github.com/siyuan-note/siyuan/commit/11115da3d0de950593ee4ce375cf7f9018484388"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23645.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23645","state":"PUBLISHED","datePublished":"2026-01-16T19:20:06.744Z","dateUpdated":"2026-01-16T21:37:58.336Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-14T16:08:37.484Z"},"containers":{"cna":{"title":"SiYuan Vulnerable to Stored Cross-Site Scripting (XSS) via Unrestricted SVG File Upload","descriptions":[{"lang":"en","value":"SiYuan is self-hosted, open source personal knowledge management software. Prior to 3.5.4-dev2, a Stored Cross-Site Scripting (XSS) vulnerability exists in SiYuan Note. The application does not sanitize uploaded SVG files. If a user uploads and views a malicious SVG file (e.g., imported from an untrusted source), arbitrary JavaScript code is executed in the context of their authenticated session. This vulnerability is fixed in 3.5.4-dev2."}],"affected":[{"vendor":"siyuan-note","product":"siyuan","versions":[{"version":"< 3.5.4-dev2","status":"affected"}]}],"references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pcjq-j3mq-jv5j","name":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pcjq-j3mq-jv5j","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/siyuan-note/siyuan/issues/16844","name":"https://github.com/siyuan-note/siyuan/issues/16844","tags":["x_refsource_MISC"]},{"url":"https://github.com/siyuan-note/siyuan/commit/11115da3d0de950593ee4ce375cf7f9018484388","name":"https://github.com/siyuan-note/siyuan/commit/11115da3d0de950593ee4ce375cf7f9018484388","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-01-16T19:20:06.744Z"},"source":{"advisory":"GHSA-pcjq-j3mq-jv5j","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-16T21:37:47.881335Z","id":"CVE-2026-23645","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-16T21:37:58.336Z"}}]}}}