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MEDIUM severity

CVE-2026-88976 — @platejs/core

MEDIUMFix: udecode/plate@d02afe4

CVE-2026-88976 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in @platejs/core. A fix is available for @platejs/core — see the affected versions and patch details below.

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

Also known asGHSA-qrfj-mgw8-j9c6
Published
Updated
Affected
2 pkgs
Patched
1 / 2
Exploits
None indexed
Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-88976.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs27th percentile — riskier than 27% of all scored CVEsHighest risk
0.00%0.28%0.56%0.84%0.3%0.3%Oct 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

2other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@platejs/corenpm
756Kdownloads / week

Description

Summary

HTML strings passed to Plate's core deserialization APIs were parsed in the active document. Certain HTML attributes could therefore trigger browser behavior during parsing, before the content was converted into editor nodes.

Applications that deserialize HTML from untrusted or cross-user sources may be affected.

Impact

An attacker who can control HTML later deserialized in another user's browser may be able to execute script in that application's origin.

Remediation

Upgrade to @platejs/core 53.3.11 or later. Users of the discontinued 54.0.0 beta builds should install the fixed stable line. Applications should also sanitize untrusted HTML before rendering it; inert parsing is not a substitute for sanitization.

Affected Packages

2 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npm@platejs/coreall versions53.3.11npm install @platejs/core@53.3.11
📦npm@platejs/core≥ 54.0.0-beta.0No fix

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @platejs/core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @platejs/core to 53.3.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-88976 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Summary HTML strings passed to Plate's core deserialization APIs were parsed in the active document. Certain HTML attributes could therefore trigger browser behavior during parsing, before the content was converted into editor nodes. Applications that deserialize HTML from untrusted or cross-user sources may be affected. ### Impact An attacker who can control HTML later deserialized in another user's browser may be able to execute script in that application's origin. ### Remediation Upgrade to `@platejs/core` 53.3.11 or later. Users of the discontinued 54.0.0 beta builds should insta
O3 Security · Impact-Aware SCA

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CVE-2026-88976: @platejs/core — Fixed in 53.3.11