CVE-2026-59809Disclosure

LOWCVSS 6.9 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-201

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-59809

Full discourse1 post

Vulmon Vulnerability Feed@VulmonFeeds46d
Disclosure
CVE-2026-59809 SiYuan MCP Tool Secret Exfiltration Vulnerability Before v3.8.0 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-59809
Post summary
The text announces CVE-2026-59809 as a secret exfiltration vulnerability in SiYuan MCP Tool before v3.8.0, but provides no PoC, exploit, patch, or evidence of active exploitation.
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