Vulnerability in symfony/ux-live-component (CVE-2026-49212)
Summary
Vulnerability in symfony/ux-live-component (CVE-2026-49212). Data can be tampered with by attackers. Exploitable via propsFromParent. Mitigation: upgrade to 3.1.0 or later.
Original description
The description as published by the source.
Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, the HMAC computed by Symfony\UX\LiveComponent\LiveComponentHydrator covered only sorted prop key/value pairs and did not include the component name, the slot identifier (props vs propsFromParent), or request context, allowing a signed blob minted for one component or slot to be replayed in another and set a read-only prop on a target component. This issue is fixed in versions 2.36.0 and 3.1.0.
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-2026-49212 has been found in symfony/ux-live-component.
Attackers can target a specific entry point like propsFromParent over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 7.5/10.
What to do: upgrade symfony/ux-live-component to 3.1.0 or later.
If unsure, ask your IT team or search "symfony/ux-live-component CVE-2026-49212" on the vendor's site.
CVE-2026-49212 (symfony/ux-live-component) — CWE-345 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: propsFromParent / props / CHECKSUM_SLOT_PROPS / CHECKSUM_SLOT_PROPS_FROM_PARENT
Patched: 3.1.0 — 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-345) exists in symfony/ux-live-component. Attackers reach the vulnerable code path via propsFromParent without authentication.
Check the vendor advisory for the affected versions of symfony/ux-live-component. Attack surface: propsFromParent / props / CHECKSUM_SLOT_PROPS / CHECKSUM_SLOT_PROPS_FROM_PARENT.
Severity: High (CVSS 7.5/10). Data can be tampered with by attackers.
Update to 3.1.0.
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 'symfony/ux-live-component' . 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
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1Identify exposure identify
grep -r 'symfony/ux-live-component' . | 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
symfony/ux-live-component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 symfony/ux-live-component to 3.1.0ステージング環境で 3.1.0 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 github.com
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com
- web github.com
- web github.com
- web github.com
- web github.com