CVE-2026-85579

SiYuan is affected by an information disclosure vulnerability (confirmed in v3.8.1, fixed in v3.8.2) in the reader-accessible POST /api/transactions/undoState endpoint. The endpoint returns the peekMutatedRootIDs list from the global undo-log stack for a caller-supplied root ID without applying publish-access visibility filtering. An authenticated reader who knows the root ID of a visible document can obtain the internal root IDs of other documents (including private or unpublished ones) modified in the same cross-document transaction, disclosing internal identifiers and cross-document relationships. Document body contents are not directly exposed.

• CWE-639

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6gf8-q9ch-w732
• https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-undostate
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6gf8-q9ch-w732

Published

Sep 4, 2026

Last Modified

Sep 8, 2026

Status

Deferred

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