---
cve: "CVE-2026-68586"
severity: "CRITICAL"
cvss: 9.2
epss: "24%"
vendor: "siyuan-note"
kev: false
exploited: false
published: "2026-08-03 14:16:28"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T08:52:30+02:00"
---

# CVE-2026-68586

> 9.2 CRITICAL · 🧪 PoC

## Beschreibung

SiYuan before v3.7.3 fails to apply publish-access filters to the getBacklinkDoc and getBackmentionDoc content endpoints (/api/ref/getBacklinkDoc and /api/ref/getBackmentionDoc). While the corresponding backlink list endpoints filter publish-forbidden documents, the content endpoints (gated only by CheckAuth) do not. A publish-mode reader — including an anonymous reader when publish Basic Auth is disabled — can call these endpoints directly with a publish-forbidden document's ID to retrieve its rendered DOM content and to determine whether the document references a given block (a reference-existence oracle).

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- eef10568384e2e7cf547adb029ae46a72e43c287 (Commit)

## Referenzen

- <https://github.com/siyuan-note/siyuan/security/advisories/GHSA-36v8-mpjm-8j5r>
- <https://www.vulncheck.com/advisories/siyuan-before-content-disclosure-via-getbacklinkdoc>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-68586) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_