CVE-2026-54759Public exploitNetwork attack vector

Command execution via unsanitized Bazaar README iframe

Published Jun 24, 2026 · Updated Jun 24, 2026

Cross-site scripting in SiYuan before 3.7.0 allows remote attackers to execute commands when a malicious Bazaar package README is viewed. The Lute sanitizer leaves iframe elements intact, and the Bazaar renderer assigns the resulting HTML to innerHTML without secondary sanitization. No installation is required; viewing package details loads attacker content whose cross-origin API access and Electron Node integration enable commands as the desktop user.

CVSS severityUnavailable
Unscored
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in SiYuan before 3.7.0 allows remote attackers to execute commands when a malicious Bazaar package README is viewed. The Lute sanitizer leaves iframe elements intact, and the Bazaar renderer assigns the resulting HTML to innerHTML without secondary sanitization. No installation is required; viewing package details loads attacker content whose cross-origin API access and Electron Node integration enable commands as the desktop user.

The record

CVE
CVE-2026-54759
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=< 3.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=< 3.7.0

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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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