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PatchSiren cyber security CVE debrief

CVE-2026-55596 udecode CVE debrief

CVE-2026-55596 is a vulnerability in the Plate rich-text editor with AI and shadcn/ui. From version 53.0.0 until 53.1.4, the media embed renderer trusts serialized provider or sourceUrl metadata in useMediaState and skips parseMediaUrl protocol validation. This allows a crafted Plate document to set a known video provider while keeping the URL as a javascript: iframe source that the registry MediaEmbedElement renders directly as an iframe src when a victim opens the document. The issue is fixed in version 53.1.4. Defenders should prioritize updating to the fixed version and implement additional security measures.

Vendor
udecode
Product
plate
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-08
Original CVE updated
2026-07-10
Advisory published
2026-07-08
Advisory updated
2026-07-10

Who should care

Developers and users of the Plate rich-text editor with AI and shadcn/ui, especially those using versions 53.0.0 to 53.1.4, should be aware of this vulnerability and take steps to mitigate it. This includes updating to version 53.1.4 or later, validating and sanitizing user-supplied metadata, and implementing Content Security Policy (CSP) to restrict iframe sources.

Technical summary

The vulnerability exists in the media embed renderer of the Plate rich-text editor. It trusts serialized provider or sourceUrl metadata in useMediaState and skips parseMediaUrl protocol validation. This allows an attacker to craft a document that sets a known video provider with a URL that is actually a javascript: iframe source. When a victim opens the document, the registry MediaEmbedElement renders this URL directly as an iframe src, potentially leading to malicious code execution. The fix involves updating to version 53.1.4, which properly validates the protocol.

Defensive priority

High

Recommended defensive actions

  • Update to version 53.1.4 or later
  • Validate and sanitize user-supplied metadata
  • Implement Content Security Policy (CSP) to restrict iframe sources
  • Monitor for suspicious document activity
  • Perform regular security audits and penetration testing
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-08T21:16:50.247Z and was last modified on 2026-07-10T19:06:45.623Z. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD data. Defenders should verify vendor guidance and assess potential exposure.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-55596 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-55596

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-55596 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-55596

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.