Security Digest · Vulnerability record
CVE-2026-33669: SiYuan has Arbitrary Document Reading within the Publishing Service
SiYuan is a personal knowledge management system.
CVSS 9.8 Critical EPSS 0.5% · p43
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Not in CISA KEV, but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.5%, percentile 43: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 43% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
github.com/siyuan-note/siyuan/kernel(Go) <= 0.0.0-20260317012524-fe4523fff2c8, no fixed version listed;github.com/siyuan-note/siyuan/kernel(Go) > 0, no fixed version listed. Check your lockfile, including transitive dependencies.
What it is
SiYuan is a personal knowledge management system. Prior to version 3.6.2, document IDs were retrieved via the /api/file/readDir interface, and then the /api/block/getChildBlocks interface was used to view the content of all documents. Version 3.6.2 patches the issue.
From the GitHub advisory
Details
Document IDs were retrieved via the /api/file/readDir interface, and then the /api/block/getChildBlocks interface was used to view the content of all documents.
PoC
Impact
File reading: All encrypted or prohibited documents under the publishing service could be read.
Weakness type: CWE-125.
Product: github.com/siyuan-note/siyuan/kernel (Go) · Assigned by: GitHub_M · Published: 2026-03-26
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| Go | github.com/siyuan-note/siyuan/kernel | <= 0.0.0-20260317012524-fe4523fff2c8 | none listed |
| Go | github.com/siyuan-note/siyuan/kernel | > 0 | none listed |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| siyuan-note | siyuan | < 3.6.2 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 0.52% probability of exploitation activity in the next 30 days; percentile 43.
Timeline
- — GitHub-reviewed advisory GHSA-34xj-66v3-6j83 published (critical)
- — CVE record published by GitHub_M
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-34xj-66v3-6j83 github.com
- CVE.org record CVE-2026-33669 cve.org
- NVD entry CVE-2026-33669 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com