CVE-2026-100646

SiYuan is a self-hosted personal knowledge management system. In versions up to and including 3.8.3, the kernel's authentication guards CheckAuth in kernel/model/session.go and IsSessionOriginAllowed in kernel/util/net.go fail open when the HTTP Origin header is absent, on the incorrect assumptio...

EUVD-2026-87740

SiYuan is a self-hosted personal knowledge management system. In versions up to and including 3.8.3, the kernel's authentication guards CheckAuth in kernel/model/session.go and IsSessionOriginAllowed in kernel/util/net.go fail open when the HTTP Origin header is absent, on the incorrect assumptio...

CVE-2026-100646: Origin Validation Error

SiYuan is a self-hosted personal knowledge management system. In versions up to and including 3.8.3, the kernel's authentication guards CheckAuth in kernel/model/session.go and IsSessionOriginAllowed in kernel/util/net.go fail open when the HTTP Origin header is absent, on the incorrect assumptio...

PT-2026-99317

Name of the Vulnerable Software and Affected Versions SiYuan versions prior to 3.8.4 Description Authentication guards CheckAuth in kernel/model/session.go and IsSessionOriginAllowed in kernel/util/net.go fail open when the HTTP Origin header is absent. This occurs because the system incorrectly...