{"schema":"threatline.record/2","record":{"id":"CVE-2026-100635","aliases":["GHSA-7j37-4gq6-wm7m"],"summary":"SiYuan before v3.8.4 Authentication Bypass via Plaintext Session Cookie","details":"SiYuan before v3.8.4 contains an authentication bypass vulnerability in the publish service where session cookies are issued without Secure or SameSite attributes over plaintext HTTP connections. An on-path attacker can observe a valid publish-visitor-session-id cookie from a Basic Auth exchange and replay it to access authenticated publish endpoints without knowing the account password.","categories":["Unclassified"],"product":"siyuan","vendor":"siyuan-note","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100635","source_modified_at":"2026-10-08T15:21:51.712Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"siyuan","vendor":"siyuan-note","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"3.8.4"},{"version":"3.8.4","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100635","source_modified_at":"2026-10-08T15:21:51.712Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"siyuan","ecosystem":null},"version":"3.8.4","basis":"first unaffected version stated in the CVE record"}],"cvss":8.2,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00259,"percentile":0.16612,"score_date":"2026-10-23"},"published_at":"2026-09-26T13:23:09.854Z","modified_at":"2026-10-08T15:21:51.712Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-100635","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-08T15:21:51.712Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-100635","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/siyuan-note/siyuan/commit/79d47867b106467c951475a9193455b48d1f3682","tags":["patch"]},{"source":"CVE List","url":"https://github.com/siyuan-note/siyuan/commit/ff4d215f78a8d6e6db6052be18b5f9f4db9c7d68","tags":["patch"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/siyuan-before-3.8.4-authentication-bypass-via-plaintext-session-cookie","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-28T18:53:29.876873Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-08T15:21:51.712Z","content_hash":"4ac2af0a2c88e4063efe68d74e086836d498e2cfea96c376b9a4ec11cfa46066"}}