CVE-2026-62204

Persistent code execution via plugin identity mismatch

Published Aug 22, 2026 · Updated Aug 22, 2026

Insufficient package identity verification in SiYuan before 3.7.4 allows attackers to persist code through Bazaar package installs. The Bazaar handlers derive the destination solely from packageName but download content from independent repoURL and repoHash values, then copy it over an existing package without cross-validation. Exploitation requires a same-origin script with administrator access; overwritten enabled plugin code runs after an application restart or manual toggle.

CVSS severity6.6
Medium
EPSS probability0.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient package identity verification in SiYuan before 3.7.4 allows attackers to persist code through Bazaar package installs. The Bazaar handlers derive the destination solely from packageName but download content from independent repoURL and repoHash values, then copy it over an existing package without cross-validation. Exploitation requires a same-origin script with administrator access; overwritten enabled plugin code runs after an application restart or manual toggle.

The record

CVE
CVE-2026-62204
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-345, T1546
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.7.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.4

Published CVSS scores

5.9VulnCheckCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L
6.6VulnCheckCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1546Event Triggered Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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