{"id":"CVE-2026-93921","state":"PUBLISHED","title":"SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint","description":"SiYuan versions through 3.8.4 fail to enforce publish access control in the getDynamicIcon endpoint, allowing read-only token holders to access document metadata. Attackers can call the endpoint with type=8 and crafted content to read block titles, names, aliases, and hierarchical paths of restricted documents via template injection.","publishedAt":"2026-09-18T23:12:07.789Z","updatedAt":"2026-09-21T14:10:37.585Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["siyuan-note siyuan"],"affected":[{"vendor":"siyuan-note","product":"siyuan","packageName":"github.com/siyuan-note/siyuan/kernel","packageURL":"pkg:golang/github.com/siyuan-note/siyuan/kernel","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"3.8.4","versionType":"semver"}],"collectionURL":"https://pkg.go.dev"}],"references":["https://github.com/siyuan-note/siyuan/security/advisories/GHSA-whcx-xxqh-c838","https://github.com/siyuan-note/siyuan","https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/router.go#L51","https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/template.go#L485-L526","https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/icon.go#L546-L549","https://www.vulncheck.com/advisories/siyuan-through-3.8.4-access-control-bypass-via-dynamic-icon-endpoint"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93921.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93921","state":"PUBLISHED","datePublished":"2026-09-18T23:12:07.789Z","dateUpdated":"2026-09-21T14:10:37.585Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-18T21:56:59.671Z"},"containers":{"cna":{"title":"SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint","descriptions":[{"lang":"en","value":"SiYuan versions through 3.8.4 fail to enforce publish access control in the getDynamicIcon endpoint, allowing read-only token holders to access document metadata. Attackers can call the endpoint with type=8 and crafted content to read block titles, names, aliases, and hierarchical paths of restricted documents via template injection."}],"affected":[{"vendor":"siyuan-note","product":"siyuan","packageName":"github.com/siyuan-note/siyuan/kernel","packageURL":"pkg:golang/github.com/siyuan-note/siyuan/kernel","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"3.8.4","versionType":"semver"}],"collectionURL":"https://pkg.go.dev"}],"references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-whcx-xxqh-c838","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-whcx-xxqh-c838)"},{"url":"https://github.com/siyuan-note/siyuan","tags":["product"]},{"url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/router.go#L51","tags":["technical-description"]},{"url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/template.go#L485-L526","tags":["technical-description"]},{"url":"https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/icon.go#L546-L549","tags":["technical-description"]},{"url":"https://www.vulncheck.com/advisories/siyuan-through-3.8.4-access-control-bypass-via-dynamic-icon-endpoint","name":"VulnCheck Advisory: SiYuan through 3.8.4 Access Control Bypass via Dynamic Icon Endpoint","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-18T23:12:07.789Z"},"datePublic":"2026-09-18T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*","versionEndIncluding":"3.8.4"}]}]}],"credits":[{"lang":"en","value":"EVIL0RD","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-whcx-xxqh-c838","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-21T14:10:30.546665Z","id":"CVE-2026-93921","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":"2026-09-21T14:10:37.585Z"}}]}}}