{"id":"CVE-2026-100635","published":"2026-09-26T14:16:45.007","lastModified":"2026-09-28T19:16:44.560","description":"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.","cvssScore":5.9,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-319"],"vendors":[],"products":[],"references":[{"url":"https://github.com/siyuan-note/siyuan/commit/79d47867b106467c951475a9193455b48d1f3682","tags":[]},{"url":"https://github.com/siyuan-note/siyuan/commit/ff4d215f78a8d6e6db6052be18b5f9f4db9c7d68","tags":[]},{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m","tags":[]},{"url":"https://www.vulncheck.com/advisories/siyuan-before-3.8.4-authentication-bypass-via-plaintext-session-cookie","tags":[]},{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m","tags":[]}],"exploitRefs":[{"url":"https://github.com/siyuan-note/siyuan/commit/79d47867b106467c951475a9193455b48d1f3682","tags":[]},{"url":"https://github.com/siyuan-note/siyuan/commit/ff4d215f78a8d6e6db6052be18b5f9f4db9c7d68","tags":[]},{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m","tags":[]},{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m","tags":[]}],"hasPoc":true,"ai":null}