CVE-2026-44588Public exploitNetwork attack vector

Code execution via URL-decoded tooltip markup

Published May 14, 2026 · Updated May 14, 2026

Stored cross-site scripting in SiYuan before 3.7.0 allows remote attackers to execute code when a user hovers over a crafted title. The tooltip path applies decodeURIComponent to an aria-label and assigns the resulting literal markup to innerHTML while Electron exposes child_process. Exploitation requires attacker-controlled document metadata to reach the desktop client and active user interaction with the affected tooltip.

CVSS severity9.4
Critical
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in SiYuan before 3.7.0 allows remote attackers to execute code when a user hovers over a crafted title. The tooltip path applies decodeURIComponent to an aria-label and assigns the resulting literal markup to innerHTML while Electron exposes child_process. Exploitation requires attacker-controlled document metadata to reach the desktop client and active user interaction with the affected tooltip.

The record

CVE
CVE-2026-44588
Published
May 14, 2026
Updated
May 14, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-1188, CWE-116, CWE-79, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

9.4GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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-1188Initialization of a Resource with an Insecure Default
CWE-116Improper Encoding or Escaping of Output
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002User Execution: Malicious File

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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