# CVE-2026-72792: SiYuan before v3.7.4 Information Disclosure via Tag API

> Unauthenticated attackers can access tag labels and counts from password-protected documents via the tag API, leaking internal terminology.

- **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-mp7r-57w4-5qm3, GO-2026-6427

## What is CVE-2026-72792?

CVE-2026-72792 is a medium-severity 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 before v3.7.4 contains an information disclosure vulnerability in the /api/tag/getTag endpoint that returns tag labels and occurrence counts from password-protected documents to unauthenticated readers. Attackers can enumerate tag vocabulary and internal terminology from password-protected documents by calling the tag endpoint without providing the document's publish password.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-72792?

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 | 0.0.0-20260726002639-4515fa257cfa |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | 0.0.0-20260726002639-4515fa257cfa |
| `github.com/siyuan-note/siyuan/kernel` | Go | All versions | 0.0.0-20260726002639-4515fa257cfa |

## How do I fix CVE-2026-72792?

Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260726002639-4515fa257cfa or later.

## Is CVE-2026-72792 being exploited?

There is no known exploitation of CVE-2026-72792 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-72792 and fix it if it is affected.

What it is: CVE-2026-72792 is a medium-severity 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-2026-72792 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 0.0.0-20260726002639-4515fa257cfa
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260726002639-4515fa257cfa
- github.com/siyuan-note/siyuan/kernel (Go): affected all versions; fixed in 0.0.0-20260726002639-4515fa257cfa

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-2026-72792/ (Markdown: https://insights.sbomify.com/CVE-2026-72792/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-72792
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72792
- OSV: https://osv.dev/vulnerability/CVE-2026-72792

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-72792/
Summaries are generated and may contain mistakes; the official description above is the record.