SiYuan: Path Traversal via Double URL Encoding in /assets/*path (publish mode arbitrary file─read), Incomplete fix of CVE-2026-41894
CVSS score
—
EPSS probability
%2.4
Risk score
—
Published
3 mo ago
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-54066 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
The patch for CVE-2026-41894 ("Path Traversal via Double URL Encoding") sanitized the `/export/` route but the **identical root cause remains in the `/assets/*path` route**. In publish mode (anonymous read-only HTTP endpoint, default port 6808), an unauthenticated remote attacker can read arbitrary files inside `WorkspaceDir` — including `conf/conf.json` (which contains the `AccessAuthCode` SHA256 hash, API token, and sync keys), `temp/siyuan.db`, `temp/blocktree.db`, and `siyuan.log` — by double-URL-encoding `..` segments. Verified against siyuan v3.6.5: - `GET /assets/%252e%252e/%252e%252e/conf/conf.json` → **HTTP 200, 10349 bytes (conf.json served)** - `GET /export/%252e%252e/%252e%252e/conf/conf.json` → HTTP 401 (patched) - `GET /assets/%2e%2e/conf/conf.json` → HTTP 404 (single-decode handled correctly)
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-54066 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | go | github.com/siyuan-note/siyuan/kernel | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
1 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.
0.0.0-20260628153353-2d5d72223df4GitLab Advisory düzeltilmiş sürüm: 0.0.0-20260628153353-2d5d72223df4
Upgrade to version 0.0.0-20260628153353-2d5d72223df4 or above.
Upgrade to version 0.0.0-20260628153353-2d5d72223df4 or above.
Public exploit and active exploitation status
Verified exploit intelligence
CVE-2026-54066 : the database holds 1 public PoC/exploit sources for it. For direct links to the sources, open the Public Exploits tab.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-54066 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-54066 weaknesses.
Official Sources and Advisories
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