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High

Magento LTS vulnerable to Stored XSS via TinyMCE WYSIWYG Editor

  • Disclosed: 08.12.2023
  • Updated: 11.10.2026 10:22

From HackerOne report #1948040 by Halit AKAYDIN (hltakydn)

Impact

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.

Patches

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

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

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package openmage/magento-lts < 20.2.0 20.2.0

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:L
Weakness (CWE)
CWE-79
Platform
Composer
Package
openmage/magento-lts
Disclosed
08.12.2023
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-9j5w-2cqc-cwj9 - CC BY 4.0

Vulnerability history: openmage/magento-lts

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (26) in the archive
Total entries
26
First → latest
08.2020 05.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 3
  • High 12
  • Medium 10
  • Low 1

Disclosures per year

Severity:
  1. Magento LTS has Weak API Session ID — Predictable MD5 of Time-Derived Inputs
    Critical CVE-2026-42155 < 20.18.0 20.18.0
  2. OpenMage LTS: Customer File Upload Extension Blocklist Bypass → Remote Code Execution
    High · 8.8 CVE-2026-40488 < 20.17.0 20.17.0
  3. OpenMage LTS: Phar Deserialization leads to Remote Code Execution
    High · 8.1 CVE-2026-25524 < 20.17.0 20.17.0
  4. Magento LTS vulnerable to Stored XSS via TinyMCE WYSIWYG Editor this entry
    High · 7.5 ghsa-9j5w-2cqc-cwj9 < 20.2.0 20.2.0
  5. Magento LTS's guest order "protect code" can be brute-forced too easily
    High · 7.5 CVE-2023-41879 < 19.5.1, >= 20.0.0, < 20.1.1 19.5.1, 20.1.1
  6. DataFlow upload remote code execution vulnerability
    High · 7.2 CVE-2021-41231 < 19.4.22, >= 20.0.0, < 20.0.19 19.4.22, 20.0.19
  7. Fix for authenticated remote code execution through layout update
    High · 8.8 CVE-2021-41144 < 19.4.22, >= 20.0.0, < 20.0.19 19.4.22, 20.0.19
  8. Fix for arbitrary file deletion in customer media allows for remote code execution
    High · 7.2 CVE-2021-41143 < 19.4.22, >= 20.0.0, < 20.0.19 19.4.22, 20.0.19
  9. Fix for arbitrary command execution in custom layout update through blocks
    High · 7.2 CVE-2021-39217 < 19.4.22, >= 20.0.0, < 20.0.19 19.4.22, 20.0.19
  10. Layout XML Arbitrary Code Fix
    High CVE-2021-32758 < 19.4.15, >= 20.0.0, < 20.0.13 19.4.15, 20.0.13
  11. Data Flow Sanitation Issue Fix
    High CVE-2021-32759 < 19.4.15, >= 20.0.0, < 20.0.13 19.4.15, 20.0.13
  12. Backport for CVE-2021-21024 Blind SQLi from Magento 2
    Critical · 9.1 CVE-2021-21427 < 19.4.13, >= 20.0.0, < 20.0.9 19.4.13, 20.0.9
  13. Fixes a bug in Zend Framework's Stream HTTP Wrapper
    Critical · 9.8 CVE-2021-21426 < 19.4.13, >= 20.0.0, < 20.0.9 19.4.13, 20.0.9
  14. RCE via PHP Object injection via SOAP Requests
    High · 8.0 CVE-2020-15244 < 19.4.8, >= 20.0.0, < 20.0.4 19.4.8, 20.0.4
  15. Observable Timing Discrepancy in OpenMage LTS
    High · 8.0 CVE-2020-15151 < 19.4.6, >= 20.0.0, < 20.0.2 19.4.6, 20.0.2

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