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CVE-2026-49858 medium CVSS 5.9

Vulnerability in api-platform/core (CVE-2026-49858)

Summary

vulnerability in api-platform/core (CVE-2026-49858). Confidential information can be exposed externally. Exploitable via ``componentsCache``. Mitigation: upgrade to `4.3.8` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-49858** has been found in api-platform/core. Attackers can target a specific entry point like ``componentsCache`` over the network to misuse the product. Confidential information can be exposed externally. CVSS score: 5.9/10. What to do: upgrade api-platform/core to **4.3.8** or later. If unsure, ask your IT team or search "api-platform/core CVE-2026-49858" on the vendor's site.
CVE-2026-49858 (api-platform/core) — CWE-524 / CVSS v3 5.9 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: `componentsCache` / `ItemNormalizer` / `true` / `false` Patched: `4.3.8` — apply immediately Workaround: Override the JSON:API and HAL `ItemNormalizer` services to gate `$context['cache_key']` with a resource-class security check, or avoid `#[ApiProperty(security: ...)]` on resources served as JSON:API or HAL until the patch is applied. Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs. Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (CWE-524) exists in api-platform/core. Attackers reach the vulnerable code path via ``componentsCache`` without authentication.
📍 Affected scope
api-platform/core — . Attack surface: `componentsCache` / `ItemNormalizer` / `true` / `false`.
🔥 Severity
Severity: Medium (CVSS 5.9/10). Confidential information can be exposed externally
🔧 How to fix
Update to **4.3.8**.
🛡️ Workaround
Workaround: Override the JSON:API and HAL `ItemNormalizer` services to gate `$context['cache_key']` with a resource-class security check, or avoid `#[ApiProperty(security: ...)]` on resources served as JSON:API or HAL until the patch is applied.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'api-platform/core' .` 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

  1. 1
    Identify exposure identify
    grep -r 'api-platform/core' . | 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 `api-platform/core` を grep し、稼働しているサービス・バージョンを把握する。

  2. 5
    Apply temporary workaround mitigate
    Override the JSON:API and HAL `ItemNormalizer` services to gate `$context['cache_key']` with a resource-class security check, or avoid `#[ApiProperty(security: ...)]` on resources served as JSON:API or HAL until the patch is applied.

    パッチが適用されるまでの応急処置として、Override the JSON:API and HAL `ItemNormalizer` services to gate `$context['cache_key']` with a resource-class security check, or avoid `#[ApiProperty(security: ...)]` on resources served as JSON:API or HAL until the patch is applied. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 6
    Apply patch patch
    Upgrade api-platform/core to 4.3.8

    ステージング環境で 4.3.8 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。

  4. 7
    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 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

composer api-platform/core
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.8"}]}]
composer api-platform/json-api
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.8"}]}]
composer api-platform/hal
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.8"}]}]

References

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