HOMEVULNERABILITIESCVE-2026-33476
HIGH

CVE-2026-33476

CWE-22Published: March 20, 2026· Updated: Mar 23, 2026

7.5
CVSS v3.1
EPSS:0.89%probability of exploitation in 30 daysPercentile:75.3th

Official Description

SiYuan is a personal knowledge management system. Prior to version 3.6.2, the Siyuan kernel exposes an unauthenticated file-serving endpoint under `/appearance/*filepath.` Due to improper path sanitization, attackers can perform directory traversal and read arbitrary files accessible to the server process. Authentication checks explicitly exclude this endpoint, allowing exploitation without valid credentials. Version 3.6.2 fixes this issue.

NVD Source

Technical Analysis

CVE-2026-33476 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

b3log1 product
siyuan
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/siyuan-note/siyuan/commit/009bb598b3beccc972aa5f1ed88b3b224326bf2a
ADVISORYhttps://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7
ADVISORYhttps://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7

All References (3)

→
https://github.com/siyuan-note/siyuan/commit/009bb598b3beccc972aa5f1ed88b3b224326bf2aPatch
→
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7Exploit · Vendor Advisory
→
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7Exploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-33476
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-22
CISA KEVNo
EPSS (30d)0.89%
Affected1 vendor
PublishedMar 20, 2026

Related CVEs (CWE-22)

CVE-2026-54917
10.0
CVE-2026-34909
KEV10.0
CVE-2026-36767
10.0
CVE-2026-39861
10.0
CVE-2026-48282
KEV10.0
CVE-2026-41211
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33476 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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