XSS in Udecode Plate
CVE-2026-55596
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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (15.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
Affected products
- Udecode Plate — versions >= 53.0.0, < 53.1.4
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-55596?
- CVE-2026-55596 is a high-severity vulnerability in Udecode Plate, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-07-08.
- How severe is CVE-2026-55596?
- High severity. CVSS v3 base score is 8.7 out of 10.