Vulnerability in github.com/siyuan-note/siyuan/kernel (CVE-2026-54067)
Summary
Vulnerability in github.com/siyuan-note/siyuan/kernel (CVE-2026-54067). Successful exploitation can lead to full system takeover. Exploitable via insertAdjacentHTML. Mitigation: upgrade to 0.0.0-20260628153353-2d5d72223df4 or later.
Original description
The description as published by the source.
Summary
A CSS snippet body containing breaks out of its surrounding tag when renderSnippet() interpolates it via insertAdjacentHTML. A payload like `` runs arbitrary JavaScript in the renderer. On Electron desktop builds the renderer runs with nodeIntegration:true, so require('child_process') is reachable from the injected handler and the XSS chains to host RCE. Snippets sync via the workspace repository, so an attacker with write access to any synced workspace plants the payload once and it fires on every device that pulls.
The bug also bypasses the user's enabledCSS / enabledJS separation. A user who turned enabledJS off was making a deliberate call not to run untrusted JavaScript; the CSS path runs it anyway.
Details
Affected:
- HEAD
96dfe0b(v3.6.5, 2026-04-21) - Sink:
app/src/config/util/snippets.ts:32 - Source:
/api/snippet/getSnippet, backed bydata/snippets/conf.json - Default config:
EnabledCSS: true,EnabledJS: trueatkernel/conf/snippet.go:26-27 - Electron config:
nodeIntegration:true,contextIsolation:false,webSecurity:falseon everyBrowserWindowinapp/electron/main.js:307,408-411,1107-1110,1150-1153,1322
The write path stores raw content. kernel/api/snippet.go:107-130 copies Content from the request straight into the snippet record with no HTML escape, no `` check, no type-specific validation:
snippet := &conf.Snippet{
ID: m["id"].(string),
Name: m["name"].(string),
Type:…
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-2026-54067 has been found in github.com/siyuan-note/siyuan/kernel.
Attackers can target a specific entry point like insertAdjacentHTML over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.9/10.
What to do: upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260628153353-2d5d72223df4 or later.
If unsure, ask your IT team or search "github.com/siyuan-note/siyuan/kernel CVE-2026-54067" on the vendor's site.
CVE-2026-54067 (github.com/siyuan-note/siyuan/kernel) — CWE-1188 / CVSS v3 9.9
Attack vector: remote (network-reachable) / no user interaction
Attack surface: insertAdjacentHTML / enabledCSS / enabledJS / BrowserWindow
Patched: 0.0.0-20260628153353-2d5d72223df4 — 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.
A vulnerability (CWE-1188) exists in github.com/siyuan-note/siyuan/kernel. Attackers reach the vulnerable code path via insertAdjacentHTML.
Check the vendor advisory for the affected versions of github.com/siyuan-note/siyuan/kernel. Attack surface: insertAdjacentHTML / enabledCSS / enabledJS / BrowserWindow.
Severity: Critical (CVSS 9.9/10). Successful exploitation can lead to full system takeover.
Update to 0.0.0-20260628153353-2d5d72223df4.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
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
-
1Identify 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。 -
2Apply patch patch
Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260628153353-2d5d72223df4ステージング環境で 0.0.0-20260628153353-2d5d72223df4 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。
-
3Post-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
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com