# CVE-2026-73043 — siyuan-note siyuan

> As of 2026-08-15, CVE-2026-73043 is a CRITICAL-severity vulnerability in siyuan-note siyuan, CVSS v3.1 9, EPSS 0.3% (30.3th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-73043 as of 2026-08-15; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-15

## What is CVE-2026-73043?

SiYuan versions before v3.7.4 contain a remote code execution vulnerability in the Template calculation operator, which renders user-authored Go templates and stores output verbatim without sanitization. Attackers can inject malicious HTML and JavaScript into template calculations that execute in the desktop client renderer with Node integration enabled, allowing arbitrary code execution when the database is opened.

The record classifies CVE-2026-73043 under weakness class [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 51 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`)
- **CVSS v4.0 base score:** 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 (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 30.3% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-15

## Is CVE-2026-73043 being exploited?

It currently carries a trending score of 37 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [siyuan-note](https://intel.threadlinqs.com/vendors/siyuan-note): siyuan

## How to fix CVE-2026-73043

No vendor patch reference has been recorded for CVE-2026-73043 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-73043

No threat campaign in the Threadlinqs corpus currently references CVE-2026-73043, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-16.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rwh7-gm74-67h6)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/siyuan-before-remote-code-execution-via-template-calculation)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-73043
Full detection coverage and IOCs for threats exploiting CVE-2026-73043 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp