CVE-2026-55596: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in udecode plate
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.
AI Analysis
Technical Summary
CVE-2026-55596 is a CWE-79 cross-site scripting vulnerability in the udecode plate rich-text editor. Versions from 53.0.0 up to 53.1.4 have a flaw in the media embed renderer where it trusts serialized provider or sourceUrl metadata in useMediaState and skips protocol validation of parseMediaUrl. This allows an attacker to craft a Plate document that sets a known video provider but uses a javascript: iframe source URL. When rendered, the MediaEmbedElement inserts this URL directly as an iframe src, enabling script execution in the context of the victim's browser. The vulnerability is resolved in version 53.1.4.
Potential Impact
Successful exploitation can lead to high-impact consequences including full compromise of confidentiality and integrity of the victim's session or data within the affected application context. The vulnerability does not affect availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade to udecode plate version 53.1.4 or later where this vulnerability is fixed. Since no official patch link or advisory is provided, verify the upgrade from the vendor or trusted source. Until upgraded, avoid opening untrusted Plate documents that may contain malicious media embeds.
CVE-2026-55596: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in udecode plate
Description
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.
CVSS v3.1
Score 8.7high
Affected software
pkg:github/udecode/plateRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-55596 is a CWE-79 cross-site scripting vulnerability in the udecode plate rich-text editor. Versions from 53.0.0 up to 53.1.4 have a flaw in the media embed renderer where it trusts serialized provider or sourceUrl metadata in useMediaState and skips protocol validation of parseMediaUrl. This allows an attacker to craft a Plate document that sets a known video provider but uses a javascript: iframe source URL. When rendered, the MediaEmbedElement inserts this URL directly as an iframe src, enabling script execution in the context of the victim's browser. The vulnerability is resolved in version 53.1.4.
Potential Impact
Successful exploitation can lead to high-impact consequences including full compromise of confidentiality and integrity of the victim's session or data within the affected application context. The vulnerability does not affect availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade to udecode plate version 53.1.4 or later where this vulnerability is fixed. Since no official patch link or advisory is provided, verify the upgrade from the vendor or trusted source. Until upgraded, avoid opening untrusted Plate documents that may contain malicious media embeds.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T23:18:03.170Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4eb690c9d9e3dbe3b6873d
Added to database: 07/08/2026, 20:44:00 UTC
Last enriched: 07/16/2026, 10:11:33 UTC
Last updated: 08/22/2026, 10:52:10 UTC
Views: 48
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