CVE-2026-73050: SiYuan before v3.7.4 Stored XSS via select option color

Severity: critical (CVSS 9.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-15 · updated 2026-08-26
Weakness: CWE-79

Description

SiYuan versions before v3.7.4 fail to validate or escape the color field in attribute-view select options, allowing stored cross-site scripting through eight unescaped render sites. Attackers can inject event-handler attributes by including quotation marks in the color value, executing arbitrary JavaScript when viewing databases containing the malicious select field.

Affected products

siyuan-note siyuan: before 3.7.4 — fixed in 3.7.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.4. Check the vendor advisory for mitigations.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-m7cc-jh9q-wxg8
https://www.vulncheck.com/advisories/siyuan-before-stored-xss-via-select-option-color
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-m7cc-jh9q-wxg8

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