# CVE-2026-73045 — siyuan-note siyuan

> As of 2026-08-15, CVE-2026-73045 is a HIGH-severity vulnerability in siyuan-note siyuan, CVSS v3.1 7.5, EPSS 0.3% (22.9th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-73045 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-2026-73045?

SiYuan before 3.7.4 contains an improper restriction of excessive authentication attempts vulnerability in the authFilePublishAccess endpoint that allows unauthenticated attackers to brute-force per-notebook publish passwords. Attackers can submit unbounded password guesses without rate limiting or CAPTCHA to gain access to password-protected published notebooks.

The record classifies CVE-2026-73045 under weakness class [CWE-307](https://intel.threadlinqs.com/cwe/CWE-307). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality. 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:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **CVSS v4.0 base score:** 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 22.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-15

## Is CVE-2026-73045 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

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

## How to fix CVE-2026-73045

No vendor patch reference has been recorded for CVE-2026-73045 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-2026-73045

No threat campaign in the Threadlinqs corpus currently references CVE-2026-73045, 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-v362-968x-gp2v)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/siyuan-before-brute-force-via-authfilepublishaccess)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-73045
Full detection coverage and IOCs for threats exploiting CVE-2026-73045 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp