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Back to active CVEs
Medium · CVSS 6.9CVE-2026-59809

SiYuan before v3.8.0 Secret Exfiltration via http_request URLCVE-2026-59809

Answer in brief

CVE-2026-59809 records a Medium severity (CVSS 6.9) vulnerability in SiYuan before v3.8.0 Secret Exfiltration via http_request URL. 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 Aug 22, 2026Updated Aug 26, 2026Source checked Oct 6, 2026First seen by HOL Aug 22, 2026Material review Aug 26, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.9. 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). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
siyuan-note/siyuangeneric>=0 <3.8.03.8.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for siyuan-note/siyuan.
  2. 2Review the reported fix. Update siyuan-note/siyuan to 3.8.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 22, 2026

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

  2. Source modified

    Aug 26, 2026

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

  3. First seen by HOL

    Aug 22, 2026

Sources and claim methodology

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

SiYuan before v3.8.0 interpolates secret placeholders into the destination URL parameter of the http_request MCP tool, allowing attackers to exfiltrate stored secrets. An MCP client can craft a request with an attacker-controlled URL containing secret placeholders to send plaintext secret values to any public host without confirmation.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Cross-Site Scripting (XSS) vulnerability identified in OpenText™ Content ManagementSame generic ecosystem
  • Denial-of-service vulnerability in ESET PROTECT On-PremSame generic ecosystem
  • HortusFox < 6.2 Remote Code Execution via Theme ImportSame generic ecosystem
  • Microsoft UFO: Authenticated Android shell command injection in Mobile MCP type_text and launch_appSame generic ecosystem
  • Microsoft UFO: Arbitrary file write in the Linux MCP `execute_command` toolSame generic ecosystem
  • Microsoft UFO: Authenticated Galaxy device registration can bypass WebSocket SSRF IP pinning via redirectsSame generic ecosystem

Record context

Vulnerability class
Tool Poisoning
EPSS
Not reported
CWE IDs
CWE-201
Source
CVE List V5
Source checked
Oct 6, 2026
References
2 linked sources
Open source record