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CVE-2026-50556 medium CVSS 6.1

Cross-Site Scripting (XSS) in @angular/platform-server (CVE-2026-50556)

Summary

Cross-site scripting in @angular/platform-server (CVE-2026-50556). Risk of unauthorized operations or information disclosure. Exploitable via domino.

Original description

The description as published by the source.

A Cross-Site Scripting (XSS) vulnerability exists in @angular/platform-server's DOM emulation dependency (domino) when serializing the content of `` elements.

When rendering dynamic text content inside a element via template bindings (such as `{{ value }}` or `[textContent]`), the template engine expects the browser to render the content safely. Under Server-Side Rendering (SSR), `domino` is configured with scripting enabled, meaning is treated as a raw-text element.

However, domino's serializer completely omitted from the list of raw-text elements requiring closing-tag escaping during DOM serialization. As a result, any occurrence of in the bound dynamic text was never escaped under any circumstances.

The unescaped closing tag was serialized directly into the output HTML (e.g. alert(1)). When parsed by a browser, it closes the block early, allowing the injected block to execute in the user's browser context, causing same-origin Cross-Site Scripting (XSS).

Impact

This vulnerability allows an attacker to perform same-origin Cross-Site Scripting (XSS) attacks against any user visiting an SSR-rendered page that binds user-controlled data inside a `` element. This can lead to session hijacking, credentials theft, unauthorized actions on behalf of users, and defacement.

Patched Versions

  • 22.0.0-rc.2
  • 21.2.16
  • 20.3.24
  • 19.2.25

Workarounds

If you cannot immediately update your dependencies, you can:

  • Avoid binding user-control…

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-2026-50556 has been found in @angular/platform-server.
Attackers can target a specific entry point like domino over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "@angular/platform-server CVE-2026-50556" on the vendor's site.

CVE-2026-50556 (@angular/platform-server) — CWE-79 / CVSS v3 6.1
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: domino
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 @angular/platform-server. Attackers reach the vulnerable code path via domino without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of @angular/platform-server. Attack surface: domino.

🔥 Severity

Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ 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 '@angular/platform-server' . 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 '@angular/platform-server' . | 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 @angular/platform-server 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
    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

npm @angular/platform-server
[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"18.2.14"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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