GHSA-9J5W-2CQC-CWJ9

From HackerOne report #1948040 by Halit AKAYDIN (hltakydn)

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

The WYSIWYG editor features could be disabled in the configuration. Possibly some WAF appliances would filter this attack.

References

Are there any links users can visit to find out more?

The attack is simply an exploit of the "onmouseover" attribute of an img element as described on OWASP XSS Filter Evasion

What kind of vulnerability is it? Who is impacted?

The TinyMCE WYSIWYG editor fails to filter scripts when rendering the HTML in specially crafted HTML tags.

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.

GHSA-9J5W-2CQC-CWJ9 has a CVSS score of 7.5 (High). The vector is network-reachable, high 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 (20.2.0); upgrading removes the vulnerable code path.

Kodem intelligence

Has the problem been patched? What versions should users upgrade to?

This vulnerability was fixed in version 20.2.0 by upgrading TinyMCE to a recent version in https://github.com/OpenMage/magento-lts/pull/3220

1. What is GHSA-9J5W-2CQC-CWJ9? GHSA-9J5W-2CQC-CWJ9 is a high-severity cross-site scripting (XSS) vulnerability in openmage/magento-lts (composer), affecting versions < 20.2.0. It is fixed in 20.2.0. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. How severe is GHSA-9J5W-2CQC-CWJ9? GHSA-9J5W-2CQC-CWJ9 has a CVSS score of 7.5 (High). 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.
3. Which versions of openmage/magento-lts are affected by GHSA-9J5W-2CQC-CWJ9? openmage/magento-lts (composer) versions < 20.2.0 is affected.
4. Is there a fix for GHSA-9J5W-2CQC-CWJ9? Yes. GHSA-9J5W-2CQC-CWJ9 is fixed in 20.2.0. Upgrade to this version or later.
5. Is GHSA-9J5W-2CQC-CWJ9 exploitable, and should I be worried? Whether GHSA-9J5W-2CQC-CWJ9 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
6. What actually determines whether GHSA-9J5W-2CQC-CWJ9 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.
7. How do I fix GHSA-9J5W-2CQC-CWJ9? Upgrade openmage/magento-lts to 20.2.0 or later.

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