What is CVE-2026-88976?

CVE-2026-88976 is a medium-severity cross-site scripting (XSS) vulnerability in @platejs/core (npm), affecting versions < 53.3.11. It is fixed in 53.3.11. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.

How severe is CVE-2026-88976?

CVE-2026-88976 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of @platejs/core are affected by CVE-2026-88976?

@platejs/core (npm) versions < 53.3.11 is affected.

Is there a fix for CVE-2026-88976?

Yes. CVE-2026-88976 is fixed in 53.3.11. Upgrade to this version or later.

Is CVE-2026-88976 exploitable, and should I be worried?

Whether CVE-2026-88976 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2026-88976 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

How do I fix CVE-2026-88976?

Upgrade @platejs/core to 53.3.11 or later.

CVE-2026-88976 in @platejs/core

Q: How severe is CVE-2026-88976?

CVE-2026-88976 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Q: Which versions of @platejs/core are affected by CVE-2026-88976?

@platejs/core (npm) versions < 53.3.11 is affected.

Q: Is there a fix for CVE-2026-88976?

Yes. CVE-2026-88976 is fixed in 53.3.11. Upgrade to this version or later.

Q: Is CVE-2026-88976 exploitable, and should I be worried?

Whether CVE-2026-88976 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2026-88976 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2026-88976?

Upgrade @platejs/core to 53.3.11 or later.

Summary

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

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.

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

CVE-2026-88976 has a CVSS score of 6.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (53.3.11); upgrading removes the vulnerable code path.

Affected versions

@platejs/core (< 53.3.11) @platejs/core (>= 54.0.0-beta.0, <= 54.0.0-beta.1)

Security releases

@platejs/core → 53.3.11 (npm)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

Already deployed Kodem?

See it in your environment New to Kodem? Get a demo →

Remediation advice

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.

Frequently Asked Questions

What is CVE-2026-88976? CVE-2026-88976 is a medium-severity cross-site scripting (XSS) vulnerability in @platejs/core (npm), affecting versions < 53.3.11. It is fixed in 53.3.11. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
How severe is CVE-2026-88976? CVE-2026-88976 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which versions of @platejs/core are affected by CVE-2026-88976? @platejs/core (npm) versions < 53.3.11 is affected.
Is there a fix for CVE-2026-88976? Yes. CVE-2026-88976 is fixed in 53.3.11. Upgrade to this version or later.
Is CVE-2026-88976 exploitable, and should I be worried? Whether CVE-2026-88976 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2026-88976 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2026-88976? Upgrade @platejs/core to 53.3.11 or later.