{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-54069: SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-54069","status":"final","version":"1","initial_release_date":"2026-06-24T21:17:02.466Z","current_release_date":"2026-06-24T21:17:02.466Z","revision_history":[{"date":"2026-06-24T21:17:02.466Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan Note's kernel HTTP server unconditionally trusts all chrome-extension:// origins, granting RoleAdministrator access to every installed browser extension without any authentication. Combined with the default empty AccessAuthCode on desktop installs, any Chrome/Chromium extension -- including a compromised legitimate extension via supply chain attack -- can make fully authenticated admin API calls to the SiYuan kernel at 127.0.0.1:6806, enabling data exfiltration, stored XSS injection, and configuration tampering. This vulnerability is fixed in 3.7.0.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-54069 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-54069"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-54069"},{"category":"external","summary":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hvr9-72v2-fff3","url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hvr9-72v2-fff3"}]},"product_tree":{"branches":[{"category":"vendor","name":"siyuan-note","branches":[{"category":"product_name","name":"siyuan","branches":[{"category":"product_version","name":"< 3.7.0","product":{"name":"siyuan-note siyuan < 3.7.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:siyuan-note:siyuan:\\<_3.7.0:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-54069","title":"SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist","notes":[{"category":"description","text":"SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan Note's kernel HTTP server unconditionally trusts all chrome-extension:// origins, granting RoleAdministrator access to every installed browser extension without any authentication. Combined with the default empty AccessAuthCode on desktop installs, any Chrome/Chromium extension -- including a compromised legitimate extension via supply chain attack -- can make fully authenticated admin API calls to the SiYuan kernel at 127.0.0.1:6806, enabling data exfiltration, stored XSS injection, and configuration tampering. This vulnerability is fixed in 3.7.0.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","baseScore":9.2,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}