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Back to active CVEs
High · CVSS 6.5CVE-2026-87809

Siyuan before v3.8.2 Information Disclosure via Export PreviewCVE-2026-87809

Answer in brief

CVE-2026-87809 records a High severity (CVSS 6.5) vulnerability in Siyuan before v3.8.2 Information Disclosure via Export Preview. The current sources do not mark it as known exploited. The current feed maps siyuan-note/siyuan (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 9, 2026Updated Sep 18, 2026Source checked Oct 25, 2026First seen by HOL Sep 9, 2026Material review Sep 18, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps siyuan-note/siyuan (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
siyuan-note/siyuangeneric>=0 <3.8.23.8.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for siyuan-note/siyuan.
  2. 2Review the reported fix. Update siyuan-note/siyuan to 3.8.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 9, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

Siyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/export/preview and /api/lute/copyStdMarkdown endpoints. Attackers with reader access can retrieve the full rendered content of private, hidden, or publish-disabled blocks by accessing public documents containing embed queries that select those blocks.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • BOLA Allows Cross-Project Target TamperingAlso CWE-639
  • IDOR: User reads and modifies findings from other people's projectsAlso CWE-639
  • RosarioSIS before 12.9.1 Missing Authorization in Teacher Save HandlersAlso CWE-639
  • yudao-cloud through 2026.09 IDOR via after-sale-log list endpointAlso CWE-639
  • Xiaozhi-esp32-server before 0.9.8 IDOR via device address-book endpointAlso CWE-639
  • ONEARMY community-platform before 2.165.2 IDOR via notification read endpointAlso CWE-639

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-639
Source
CVE List V5
Source checked
Oct 25, 2026
References
2 linked sources
Open source record