CVE-2026-75916Public exploit

Code execution via unescaped hint metadata

Published Aug 19, 2026 · Updated Aug 19, 2026

Cross-site scripting in SiYuan through 3.7.3 allows attackers to execute OS commands via crafted block metadata in (( hints. In app/src/protyle/hint/extend.ts, genHintItemHTML() concatenates a block's name, alias, and memo into popup HTML without escaping, so a self-firing tag executes as soon as the autocomplete list renders. Reachability requires attacker-controlled content to land in a workspace the victim opens and be surfaced by normal '((' reference typing; Electron's nodeIntegration and disabled contextIsolation then expose child_process at the victim's privilege level.

CVSS severity8.6
High
EPSS probability0.16%
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 through 3.7.3 allows attackers to execute OS commands via crafted block metadata in (( hints. In app/src/protyle/hint/extend.ts, genHintItemHTML() concatenates a block's name, alias, and memo into popup HTML without escaping, so a self-firing tag executes as soon as the autocomplete list renders. Reachability requires attacker-controlled content to land in a workspace the victim opens and be surfaced by normal '((' reference typing; Electron's nodeIntegration and disabled contextIsolation then expose child_process at the victim's privilege level.

The record

CVE
CVE-2026-75916
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-79, T1059.007
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanAffected versions are unavailable in this record.

Published CVSS scores

8.6StrixCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
9.3StrixCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript

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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