CVE-2026-59809
Last modified
CVE-2026-59809 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. 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.. EPSS estimates a 0.24% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| siyuan-note | siyuan | < 3.8.0 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
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