{"cve":"CVE-2026-30926","nvd":{"published":"2026-03-10T07:44:56.943","modified":"2026-06-17T10:33:09.790","status":"Analyzed","description":"SiYuan is a personal knowledge management system. Prior to 3.5.10, a privilege escalation vulnerability exists in the publish service of SiYuan Note that allows low-privilege publish accounts (RoleReader) to modify notebook content via the /api/block/appendHeadingChildren API endpoint. The endpoint requires only the model.CheckAuth role, which accepts RoleReader sessions, but it does not enforce stricter checks, such as CheckAdminRole or CheckReadonly. This allows remote authenticated publish users with read-only privileges to append new blocks to existing documents, compromising the integrity of stored notes.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","score":7.1},"cwes":["CWE-862","CWE-284"],"references":["https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523","https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523"],"products":["b3log:siyuan"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-30926","score":0.00324,"percentile":0.2543,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-f9cq-v43p-v523","url":"https://osv.dev/vulnerability/GHSA-f9cq-v43p-v523","summary":"SiYuan: Authorization Bypass Allows Low-Privilege Publish User to Modify Notebook Content via /api/block/appendHeadingChildren","modified":"2026-03-23T04:56:00.822934281Z","packages":[{"ecosystem":"Go","name":"github.com/siyuan-note/siyuan/kernel","purl":"pkg:golang/github.com/siyuan-note/siyuan/kernel","ranges":["<=0.0.0-20260304035530-d03ebdec8279"],"fixed":[]}]},{"id":"GO-2026-4658","url":"https://osv.dev/vulnerability/GO-2026-4658","summary":"SiYuan: Authorization Bypass Allows Low-Privilege Publish User to Modify Notebook Content via /api/block/appendHeadingChildren in github.com/siyuan-note/siyuan/kernel","modified":"2026-03-23T04:52:50.925159Z","packages":[{"ecosystem":"Go","name":"github.com/siyuan-note/siyuan/kernel","purl":"pkg:golang/github.com/siyuan-note/siyuan/kernel","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}