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Back to active CVEs
Medium · CVSS 4.9CVE-2026-82651GHSA-3CM4-CCVW-6XR6

SiYuan before v3.8.1 Missing Authorization via /history and /repo/diffCVE-2026-82651

Answer in brief

CVE-2026-82651 records a Medium severity (CVSS 4.9) vulnerability in SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff. The current sources do not mark it as known exploited. The current feed maps siyuan-note/siyuan (generic), github.com/siyuan-note/siyuan/kernel (go), github.com/siyuan-note/siyuan/kernel (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Aug 30, 2026Updated Oct 5, 2026Source checked Oct 14, 2026First seen by HOL Oct 5, 2026Material review Oct 5, 2026
Upstream Advisory

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-200, CWE-862
Source
CVE List V5
Source checked
Oct 14, 2026
References
6 linked sources
Open source record

Key facts

Risk
Medium · CVSS 4.9
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 4.9. 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), github.com/siyuan-note/siyuan/kernel (go), github.com/siyuan-note/siyuan/kernel (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
siyuan-note/siyuangeneric>=0 <3.8.13.8.1
github.com/siyuan-note/siyuan/kernelgo<0.0.0-20260816034002-035bf9a8c3110.0.0-20260816034002-035bf9a8c311
github.com/siyuan-note/siyuan/kernelgo>=0 <0.0.0-20260816034002-035bf9a8c3110.0.0-20260816034002-035bf9a8c311

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for siyuan-note/siyuan, github.com/siyuan-note/siyuan/kernel, github.com/siyuan-note/siyuan/kernel.
  2. 2Review the reported fix. Update siyuan-note/siyuan to 3.8.1; github.com/siyuan-note/siyuan/kernel to 0.0.0-20260816034002-035bf9a8c311; github.com/siyuan-note/siyuan/kernel to 0.0.0-20260816034002-035bf9a8c311 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 30, 2026

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

  2. Source modified

    Oct 5, 2026

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

  3. First seen by HOL

    Oct 5, 2026

Sources and claim methodology

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

SiYuan before v3.8.1 does not apply the IsForbiddenAbsPath guard (introduced in GHSA-c8r8-95hg-mp34) to the /history/*path and /repo/diff/*path endpoints in kernel/server/serve.go. These routes require admin authentication but construct file paths independently, so an authenticated administrator can retrieve historical snapshots of sensitive files that the guard is meant to block, including data/.siyuan/publishAccess.json (plaintext publish-mode passwords) and files under data/templates/.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • dbt: Unauthenticated Arbitrary SQL Execution in `dbt docs serve`Also CWE-200
  • Pipecat: Public exposure of Pipecat’s development runner can allow unauthenticated bot session creationAlso CWE-862
  • WordPress Skydropx plugin <= 2.1.4 - Broken Access Control vulnerabilityAlso CWE-862
  • Evolution-data-server: local file disclosure via attach file:// urisAlso CWE-200
  • FOG adInfo endpoint is reported to disclose the Active Directory join passwordAlso CWE-200
  • PAN-OS: Authenticated Remote Code Execution (RCE) in the Management InterfaceSame generic ecosystem