# CVE-2026-72800: SiYuan before v3.7.4 Information Disclosure via Unfiltered API

> Authenticated users can bypass publish restrictions to access hidden document schemas and block IDs in SiYuan.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 Aug 2026
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-5fhr-f75j-8wr9, GO-2026-6395

## What is CVE-2026-72800?

CVE-2026-72800 is a medium-severity missing authorization vulnerability in siyuan-note siyuan, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

SiYuan versions before v3.7.4 fail to apply publish-access filtering to the getAttributeViewKeysByID endpoint, allowing authenticated readers to retrieve complete database column schemas including descriptions, select vocabularies, and template expressions. Additionally, getBlockDefIDsByRefText and getBlockRelevantIDs endpoints enumerate workspace-wide block IDs without publish scoping, enabling attackers to discover valid block identifiers across publish boundaries and access content from hidden or password-protected documents.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-72800?

3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | 0.0.0-20260724103335-f36331956ae9 |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | 0.0.0-20260724103335-f36331956ae9 |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | 0.0.0-20260724103335-f36331956ae9 |

## How do I fix CVE-2026-72800?

Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260724103335-f36331956ae9 or later.

## Is CVE-2026-72800 being exploited?

There is no known exploitation of CVE-2026-72800 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-72800 and fix it if it is affected.

What it is: CVE-2026-72800 is a medium-severity missing authorization vulnerability in siyuan-note siyuan, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-72800 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260724103335-f36331956ae9
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260724103335-f36331956ae9
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260724103335-f36331956ae9

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-72800/ (Markdown: https://insights.sbomify.com/CVE-2026-72800/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-72800
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72800
- OSV: https://osv.dev/vulnerability/CVE-2026-72800

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-72800/
Summaries are generated and may contain mistakes; the official description above is the record.