CVE-2026-54070Public exploitNetwork attack vector

Stored XSS via incomplete event-handler blocklist

Published Jun 24, 2026 · Updated Jun 24, 2026

Stored XSS in SiYuan before 3.7.0 allows remote attackers to execute JavaScript in an Administrator's origin via a crafted Bazaar README. renderPackageREADME passes the README through Lute's fixed event-handler denylist, which omits modern handlers, before the frontend assigns the resulting HTML to innerHTML. Exploitation requires marketplace trust and an Administrator to open and interact with the listing; the script then gains control of the authenticated workspace.

CVSS severity7.1
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in SiYuan before 3.7.0 allows remote attackers to execute JavaScript in an Administrator's origin via a crafted Bazaar README. renderPackageREADME passes the README through Lute's fixed event-handler denylist, which omits modern handlers, before the frontend assigns the resulting HTML to innerHTML. Exploitation requires marketplace trust and an Administrator to open and interact with the listing; the script then gains control of the authenticated workspace.

The record

CVE
CVE-2026-54070
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-184, CWE-79, T1189
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

7.1GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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