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CVE-2026-34448 critical CVSS 9.0

Cross-Site Scripting (XSS) in github.com/siyuan-note/siyuan/kernel (CVE-2026-34448)

Summary

Cross-site scripting in github.com/siyuan-note/siyuan/kernel (CVE-2026-34448). Successful exploitation can lead to full system takeover. Exploitable via mAsse. Mitigation: upgrade to 3.6.2 or later.

Original description

The description as published by the source.

Summary

An attacker who can place a malicious URL in an Attribute View mAsse field can trigger stored XSS when a victim opens the Gallery or Kanban view with “Cover From -> Asset Field” enabled. The vulnerable code accepts arbitrary http(s) URLs without extensions as images, stores the attacker-controlled string in coverURL, and injects it directly into an `` attribute without escaping. In the Electron desktop client, the injected JavaScript executes with nodeIntegration enabled and contextIsolation disabled, so the XSS reaches arbitrary OS command execution under the victim’s account.

Details

The vulnerable flow is:

  1. IsPossiblyImage(assetPath) accepts arbitrary http(s) URLs without validating that they are safe image URLs.
  2. When an Attribute View card uses Cover From -> Asset Field, the application copies asset.Content directly into galleryCard.CoverURL / kanbanCard.CoverURL.
  3. The front-end renderer inserts coverURL directly into `` without escaping quotes or other attribute-breaking characters.
  4. A payload such as https://example.com/" onerror="require('child_process').exec('calc') breaks out of the src attribute and adds an attacker-controlled onerror handler.
    When the image fails to load, the injected JavaScript runs in the Electron renderer. Because the desktop app enables nodeIntegration: true and disables contextIsolation and webSecurity, that JavaScript can access Node.js APIs and execute system commands.

PoC

1.…

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-2026-34448 has been found in github.com/siyuan-note/siyuan/kernel.
Attackers can target a specific entry point like mAsse over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.0/10.
What to do: upgrade github.com/siyuan-note/siyuan/kernel to 3.6.2 or later.
If unsure, ask your IT team or search "github.com/siyuan-note/siyuan/kernel CVE-2026-34448" on the vendor's site.

CVE-2026-34448 (github.com/siyuan-note/siyuan/kernel) — CWE-79 / CVSS v3 9.0
Attack vector: remote (network-reachable)
Attack surface: mAsse / coverURL / nodeIntegration / contextIsolation
Patched: 3.6.2 — 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

Cross-site scripting (XSS) (CWE-79) exists in github.com/siyuan-note/siyuan/kernel. Attackers reach the vulnerable code path via mAsse.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/siyuan-note/siyuan/kernel. Attack surface: mAsse / coverURL / nodeIntegration / contextIsolation.

🔥 Severity

Severity: Critical (CVSS 9.0/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 3.6.2.

🛡️ 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 3.6.2

    ステージング環境で 3.6.2 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":"3.6.2"}]}]

References

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