Sign in Sign up
JA · EN · FR
SecPulse
Categories
CVE-2026-72803 medium CVSS 5.8

Vulnerability in github.com/siyuan-note/siyuan/kernel (CVE-2026-72803)

Summary

Vulnerability in github.com/siyuan-note/siyuan/kernel (CVE-2026-72803). Risk of unauthorized operations or information disclosure. Exploitable via POST /api/attr/getBlockAttrs. Mitigation: upgrade to 0.0.0-20260724093256-229fdffd7e4a or later.

Original description

The description as published by the source.

CVE: This vulnerability corresponds to CVE-2026-72803.

Summary

POST /api/attr/getBlockAttrs and POST /api/attr/batchGetBlockAttrs return a block's full attribute set (IAL) with no publish-access check. Both are CheckAuth-only, so they are reachable by the publish RoleReader token and by the anonymous account when Publish.Auth.Enable is false. An anonymous reader supplying a block ID receives the block's name, alias, memo, bookmark, tags, and every custom-* attribute including for blocks in publish-forbidden and password-protected documents. The batch variant accepts an ID list, making it a bulk extraction primitive.

Details

Neither handler applies a filter:

// /api/attr/getBlockAttrs      (router line 301)
ret.Data = sql.GetBlockAttrs(id)

// /api/attr/batchGetBlockAttrs (router line 302)
ret.Data = sql.BatchGetBlockAttrs(idList)

sql.GetBlockAttrs is a direct database read returning the block's entire IAL: name, alias, memo, bookmark, tags, and any custom-* key/value the user has set. Several of these are user-authored free text memos in particular are freeform notes attached to a block so this is document content, not merely structural metadata.

batchGetBlockAttrs takes an arbitrary list of block IDs in a single request, so an attacker holding a set of block IDs can sweep attributes across the entire workspace in one call.

Guarded-sibling asymmetry. The sibling…

Source: NIST National Vulnerability Database 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-2026-72803 has been found in github.com/siyuan-note/siyuan/kernel.
Attackers can target a specific entry point like POST /api/attr/getBlockAttrs 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 0.0.0-20260724093256-229fdffd7e4a or later.
If unsure, ask your IT team or search "github.com/siyuan-note/siyuan/kernel CVE-2026-72803" on the vendor's site.

CVE-2026-72803 (github.com/siyuan-note/siyuan/kernel) — CWE-862 / CVSS v3 5.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: POST /api/attr/getBlockAttrs / POST /api/attr/batchGetBlockAttrs / CheckAuth / RoleReader
Patched: 0.0.0-20260724093256-229fdffd7e4a — 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 POST /api/attr/getBlockAttrs without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/siyuan-note/siyuan/kernel. Attack surface: POST /api/attr/getBlockAttrs / POST /api/attr/batchGetBlockAttrs / CheckAuth / RoleReader.

🔥 Severity

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

🔧 How to fix

Update to 0.0.0-20260724093256-229fdffd7e4a.

🛡️ 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 POST /api/attr/getBlockAttrs requests with malformed payloads or SQL meta-characters. 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
    Hunt for indicators of compromise detect 
    grep 'POST /api/attr/getBlockAttrs' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで POST /api/attr/getBlockAttrs への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。

  3. 3
    Apply patch patch 
    Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260724093256-229fdffd7e4a

    ステージング環境で 0.0.0-20260724093256-229fdffd7e4a 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と、Step 2 で見つけた異常検知の続報チェックを含めること。

  4. 4
    Post-deployment verification verify 
    Replay attack against POST /api/attr/getBlockAttrs on staging to confirm patch closes the vector

    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 Step 2 と同じログクエリ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":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.0-20260724093256-229fdffd7e4a"}]}]

References

We use cookies for analytics and ad measurement. This setting applies to all Game co., Ltd. sites. Details