@platejs/core HTML deserialization can trigger browser behavior during parsing

published 2026-09-16 53 d ago modified 2026-09-17 52 d ago also GHSA-qrfj-mgw8-j9c6 , EUVD-2026-80782

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits: 0; none known

Plate is a rich-text editor with AI and shadcn/ui. Prior to 53.3.11, and in the discontinued 54.0.0-beta.0 through 54.0.0-beta.1 builds, Plate core HTML deserialization APIs parse supplied HTML strings in the active document. When an application passes untrusted or cross-user HTML to these APIs, certain HTML attributes can trigger browser behavior before the HTML is converted into editor nodes. This can allow attacker-controlled script to execute in the consuming application's origin when another user loads the deserialized content. This issue is fixed in version 53.3.11.

Patch / fix

fixed in 1 links 3

npm @platejs/core 53.3.11

github.com/udecode/plate@d02afe4 commit
github.com/udecode/plate#5117 pull request
github.com/udecode/plate/releases/tag/v53.3.11 release

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 53 d ago (2026-09-16)

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	@platejs/core	<53.3.11 >=54.0.0-beta.0, <=54.0.0-beta.1	53.3.11

Affected products

udecode plate

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary