CVE-2026-73041CWE-79cross-site-scripting

CVE-2026-73041

Critical · published August 16, 2026

CVSS v3.1
9.0
EPSS
0%
Percentile
36.0
In the wild
Unconfirmed
What it is

SiYuan versions before v3.7.4 fail to validate or escape annotation fields written to disk by the setFileAnnotation endpoint. Attackers can inject malicious markup into annotation fields that execute as script in the PDF renderer with full Node.js access when a user opens an annotated PDF.

The record
Technical detail
CVSS v3.1
9.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
9.4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
EPSS
0.00428 · 36.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-16T02:16Z
References (3)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-fqpw-c3pj-w8g9 · [email protected]https://www.vulncheck.com/advisories/siyuan-before-remote-code-execution-via-pdf-annotations · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-fqpw-c3pj-w8g9 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 15 AUG 21:44Z
    SiYuan before v3.7.4 Remote Code Execution via PDF Annotations
    cvelistv5