CVE-2026-85579 PUBLISHED

SiYuan before v3.8.2 Information Disclosure via undoState

Assigner: VulnCheck
Reserved: 04.09.2026 Published: 04.09.2026 Updated: 04.09.2026

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who knows the root ID of a visible document can obtain the internal root IDs of other documents (including private or unpublished ones) modified in the same cross-document transaction, disclosing internal identifiers and cross-document relationships.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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.3

Product Status

Vendor siyuan-note
Product siyuan
Versions Default: unaffected
  • affected from 0 to 3.8.2 (excl.)
  • Version 3.8.2 is unaffected

Credits

  • alham-rizvi reporter

References

Problem Types

  • Authorization Bypass Through User-Controlled Key CWE