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CVE-2026-73609 medium CVSS 5.8

Vulnerability in github.com/siyuan-note/siyuan/kernel (CVE-2026-73609)

Summary

Vulnerability in github.com/siyuan-note/siyuan/kernel (CVE-2026-73609). Risk of unauthorized operations or information disclosure. Exploitable via CheckAuth. Mitigation: upgrade to 0.0.0-20260812083335-251596fc0de2 or later.

Original description

The description as published by the source.

Summary

/api/attr/getBookmarkLabels is registered with CheckAuth only and applies no filtering of any kind. It runs a scan of the entire blocks table and returns the distinct set of every bookmark label in the workspace. An anonymous reader in publish mode receives the author's complete bookmark vocabulary, regardless of whether the bookmarked blocks live in published, hidden, password-protected or forbidden documents.

The adjacent endpoint that returns bookmarks with their blocks does filter, and does so in a way that makes the intended rule explicit: it drops a label entirely when no accessible block carries it.

Details

Route. kernel/api/router.go:297 on master, :300 on the development branch:

ginServer.Handle("POST", "/api/attr/getBookmarkLabels", model.CheckAuth, getBookmarkLabels)

No CheckAdminRole, no CheckReadonly. Reachable by the publish RoleReader token and anonymously when Publish.Auth.Enable is false.

The handler (kernel/api/attr.go) is a single line:

ret.Data = model.BookmarkLabels()

which reaches kernel/model/bookmark.go:184 and then sql.QueryBookmarkLabels() at kernel/sql/block_query.go:315:

sqlStmt := "SELECT * FROM blocks WHERE ial LIKE ?"   // "%bookmark=%"
// collect distinct ialAttr(block.IAL, "bookmark") into a set, sort, return

There is no notebook scoping, no path scoping, no publish-access check and no filter function anywhere on the path. Every block in the workspace…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-73609 has been found in github.com/siyuan-note/siyuan/kernel.
Attackers can target a specific entry point like CheckAuth over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.8/10.
What to do: upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260812083335-251596fc0de2 or later.
If unsure, ask your IT team or search "github.com/siyuan-note/siyuan/kernel CVE-2026-73609" on the vendor's site.

CVE-2026-73609 (github.com/siyuan-note/siyuan/kernel) — CWE-862 / CVSS v3 5.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: CheckAuth / blocks / CheckAdminRole / CheckReadonly
Patched: 0.0.0-20260812083335-251596fc0de2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-862) exists in github.com/siyuan-note/siyuan/kernel. Attackers reach the vulnerable code path via CheckAuth without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/siyuan-note/siyuan/kernel. Attack surface: CheckAuth / blocks / CheckAdminRole / CheckReadonly.

🔥 Severity

Severity: Medium (CVSS 5.8/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 0.0.0-20260812083335-251596fc0de2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/siyuan-note/siyuan/kernel' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'github.com/siyuan-note/siyuan/kernel' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で github.com/siyuan-note/siyuan/kernel を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260812083335-251596fc0de2

    ステージング環境で 0.0.0-20260812083335-251596fc0de2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

go github.com/siyuan-note/siyuan/kernel
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20260812083335-251596fc0de2"}]}]

References

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