Cross-Site Scripting (XSS) in @platejs/media (CVE-2026-55596)
Summary
Cross-site scripting in @platejs/media (CVE-2026-55596). Confidential information can be exposed externally. Exploitable via provider. Mitigation: upgrade to 53.1.4 or later.
Original description
The description as published by the source.
Plate is a rich-text editor with AI and shadcn/ui. From 53.0.0 until 53.1.4, the media embed renderer trusts serialized provider or sourceUrl metadata in useMediaState and skips parseMediaUrl protocol validation, allowing a crafted Plate document to set a known video provider while keeping url as a javascript: iframe source that the registry MediaEmbedElement renders directly as an iframe src when a victim opens the document. This issue is fixed in version 53.1.4.
Source: NIST National Vulnerability Database 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-2026-55596 has been found in @platejs/media.
Attackers can target a specific entry point like provider over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 8.7/10.
What to do: upgrade @platejs/media to 53.1.4 or later.
If unsure, ask your IT team or search "@platejs/media CVE-2026-55596" on the vendor's site.
CVE-2026-55596 (@platejs/media) — CWE-79 / CVSS v3 8.7
Attack vector: remote (network-reachable)
Attack surface: provider / sourceUrl / url / src
Patched: 53.1.4 — 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.
Cross-site scripting (XSS) (CWE-79) exists in @platejs/media. Attackers reach the vulnerable code path via provider.
Check the vendor advisory for the affected versions of @platejs/media. Attack surface: provider / sourceUrl / url / src.
Severity: High (CVSS 8.7/10). Confidential information can be exposed externally.
Update to 53.1.4.
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 '@platejs/media' . 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
-
1Identify exposure identify
grep -r '@platejs/media' . | 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
@platejs/media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 @platejs/media to 53.1.4ステージング環境で 53.1.4 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 nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- patch github.com
- web github.com
- web github.com