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CVE-2026-74802 high CVSS 8.2

Vulnerability in github.com/siyuan-note/siyuan/kernel (CVE-2026-74802)

Summary

Vulnerability in github.com/siyuan-note/siyuan/kernel (CVE-2026-74802). Confidential information can be exposed externally. Exploitable via websocket.Upgrader. Mitigation: upgrade to 0.0.0-20260803045322-cb67e0b4fab5 or later.

Original description

The description as published by the source.

High

Package

gomod github.com/siyuan-note/siyuan/kernel

Affected versions

3.7.3

Patched versions

(none yet — leave blank until a fix is released)

Description

Summary

/ws/network/proxy is an admin-only WebSocket forward-proxy endpoint (target URL and headers fully attacker-specifiable via query parameters). Its websocket.Upgrader explicitly overrides CheckOrigin to unconditionally return true — disabling the origin validation that the gorilla/websocket library otherwise enforces by default. WebSocket handshake requests are not subject to CORS preflight at all (unlike fetch/XHR), so origin validation for WebSocket endpoints has to be done deliberately by the server; here it has been deliberately turned off instead. Combined with the endpoint's own query-parameter-driven proxy target, this is a textbook Cross-Site WebSocket Hijacking (CSWSH) primitive on a capability that amounts to an authenticated network pivot through the SiYuan kernel process.

Details

// kernel/api/network.go:501
upgrader := websocket.Upgrader{
    CheckOrigin: func(r *http.Request) bool { return true },
}
clientConn, upgradeErr := upgrader.Upgrade(c.Writer, c.Request, upgradeHeaders)

Route registration (admin-role-gated):

// kernel/api/router.go:614
ginServer.Handle("GET", "/ws/network/proxy", model.CheckAuth, model.CheckAdminRole, wsProxy)

The proxy target is fully attacker-controllable via query parameters, decoded and dialed direc…

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-2026-74802 has been found in github.com/siyuan-note/siyuan/kernel.
Attackers can target a specific entry point like websocket.Upgrader over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 8.2/10.
What to do: upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260803045322-cb67e0b4fab5 or later.
If unsure, ask your IT team or search "github.com/siyuan-note/siyuan/kernel CVE-2026-74802" on the vendor's site.

CVE-2026-74802 (github.com/siyuan-note/siyuan/kernel) — CWE-346 / CVSS v3 8.2
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: websocket.Upgrader / CheckOrigin / true / fetch
Patched: 0.0.0-20260803045322-cb67e0b4fab5 — 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-346) exists in github.com/siyuan-note/siyuan/kernel. Attackers reach the vulnerable code path via websocket.Upgrader without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/siyuan-note/siyuan/kernel. Attack surface: websocket.Upgrader / CheckOrigin / true / fetch.

🔥 Severity

Severity: High (CVSS 8.2/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 0.0.0-20260803045322-cb67e0b4fab5.

🛡️ 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 0.0.0-20260803045322-cb67e0b4fab5

    ステージング環境で 0.0.0-20260803045322-cb67e0b4fab5 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":"0.0.0-20260803045322-cb67e0b4fab5"}]}]

References

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