CVE-2026-85579

MEDIUM 4.3

SiYuan before v3.8.2 Information Disclosure via undoState

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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who knows the root ID of a visible document can obtain the internal root IDs of other documents (including private or unpublished ones) modified in the same cross-document transaction, disclosing internal identifiers and cross-document relationships.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	CWE-639
Vendor	siyuan-note
Product	siyuan
Published	Sep 4, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

siyuan-note / siyuan

0 < 3.8.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 alham-rizvi