CVE-2026-88976 @platejs/core HTML deserialization can trigger browser behavior during parsing
Attackers can execute arbitrary scripts in the victim's browser by supplying malicious HTML to the Plate editor's deserialization APIs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-88976?
CVE-2026-88976 is a medium-severity cross-site scripting vulnerability in udecode plate, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-88976?
4 open source packages ship an affected version, including @platejs/core.
| Package | Affected | Fixed in |
|---|---|---|
@platejs/core npm | All versions | 53.3.11 |
@platejs/core npm | All versions | 53.3.11 |
@platejs/core npm | From 54.0.0-beta.0 to 54.0.0-beta.1 | None |
@platejs/core npm | From 54.0.0-beta.0 to 54.0.0-beta.1 | None |
How do I fix CVE-2026-88976?
Upgrade @platejs/core to 53.3.11 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-88976 being exploited?
There is no known exploitation of CVE-2026-88976 in the wild and no public exploit code.
Sources
Also known as GHSA-qrfj-mgw8-j9c6.