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CVE-2026-44429
Cross-Site Scripting (XSS) in github.com/modelcontextprotocol/registry (CVE-2026-44429)
Summary
cross-site scripting in github.com/modelcontextprotocol/registry (CVE-2026-44429). Risk of unauthorized operations or information disclosure. Exploitable via `POST /v0/auth/github-at`. Mitigation: upgrade to `1.7.7` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-44429** has been found in github.com/modelcontextprotocol/registry.
Attackers can target a specific entry point like `POST /v0/auth/github-at` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade github.com/modelcontextprotocol/registry to **1.7.7** or later.
If unsure, ask your IT team or search "github.com/modelcontextprotocol/registry CVE-2026-44429" on the vendor's site.
CVE-2026-44429 (github.com/modelcontextprotocol/registry) — CWE-79 /
Attack surface: POST /v0/auth/github-at / POST /v0/auth/none / `server.websiteUrl` / `validateWebsiteURL`
Patched: `1.7.7` — 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/modelcontextprotocol/registry. Attackers reach the vulnerable code path via `POST /v0/auth/github-at` without authentication.
📍 Affected scope
github.com/modelcontextprotocol/registry — . Attack surface: POST /v0/auth/github-at / POST /v0/auth/none / `server.websiteUrl` / `validateWebsiteURL`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.7.7**.
🛡️ 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 /v0/auth/github-at` requests with malformed payloads or SQL meta-characters. Run `grep -r 'github.com/modelcontextprotocol/registry' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'github.com/modelcontextprotocol/registry' . | 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/modelcontextprotocol/registry` を grep し、稼働しているサービス・バージョンを把握する。
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3Hunt for indicators of compromise detect
grep 'POST /v0/auth/github-at' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで `POST /v0/auth/github-at` 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。
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6Apply patch patch
Upgrade github.com/modelcontextprotocol/registry to 1.7.7ステージング環境で 1.7.7 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 3 で見つけた異常検知の続報チェックを含めること。
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7Post-deployment verification verify
Replay attack against POST /v0/auth/github-at 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 3 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/modelcontextprotocol/registry
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.7"}]}]
References
- web https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-rqv2-m695-f8j4
- web https://github.com/modelcontextprotocol/registry/pull/1249
- web https://github.com/modelcontextprotocol/registry/commit/78b7bbde07948049b916d76b4769faee461ff930
- web https://github.com/modelcontextprotocol/registry/releases/tag/v1.7.7
- web https://github.com/advisories/GHSA-rqv2-m695-f8j4