9.4

CVE-2026-73053: siyuan-note siyuan Cross-site Scripting

CVSS: 9.4v4.0CriticalDeferred
Published 15-08-2026Last modified 18-08-2026
Open JSON

Vulnerability summary

CVE-2026-73053 is a critical (CVSS 9.4) Cross-site Scripting vulnerability in siyuan-note siyuan. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 43.2% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.4/10
010
Critical · v4.0 (CVE.org)
EPSS score
0.52%
0%100%
Low · +0.24 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 18-08-2026
    Last modifiedVulnerability information updated.

Description

SiYuan versions before v3.7.4 contain a cross-site scripting vulnerability in the unicode2Emoji function that fails to sanitize codepoint branch output. Attackers can craft document icons with hex-encoded markup that executes in the renderer with Node integration enabled, achieving arbitrary code execution on the host system.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

+0.24 pp

From 0.28% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Siyuan-note1 product

1 vendor · 1 product

References

2 links