CVE-2026-59809
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 6.9
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- EPSS probability
- 0.24%
- CWE
- CWE-201
- Published
- 2026-08-22
- Last modified
- 2026-08-26
Affected products
- siyuan-note siyuan
- siyuan-note siyuan
Weakness type
Related vulnerabilities
- CVE-2026-87015 — Open WebUI: A user's session cookies are sent to tool servers configured for bearer authentication
- CVE-2026-65812 — Microsoft Teams for Android Information Disclosure Vulnerability
- CVE-2026-86505 — In JetBrains IntelliJ IDEA before 2026.2.2 missing project-trust check leaked project metadata to...
- CVE-2026-86497 — In JetBrains YouTrack before 2026.2.18769 changing a mailbox host without re-authentication allowed...
- CVE-2026-85307 — WordPress KP Agent Ready plugin < 1.2.08 - Sensitive Data Exposure vulnerability
- CVE-2026-77123 — Nexus Repository 3 - Webhook Secret Disclosure via Capability Read API
- CVE-2026-81162 — DXPR Builder: The AI Visual Page Builder for Drupal - Moderately critical - Information Disclosure - SA-CONTRIB-2026-112
- CVE-2026-81280 — WordPress Print Barcode Labels for your WooCommerce products/orders plugin <= 4.0.0 - Sensitive Data Exposure vulnerability