# Mortgage Calculator <= 1.3.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'mortgage_calculator' Shortcode 'title' Attribute

- **ID:** WPSEC-2026-1423
- **Plugin:** Mortgage Calculator (`mortgage-calculator`), https://wordpress.org/plugins/mortgage-calculator/
- **Affected versions:** from 1.2.0 before 1.3.1
- **Fixed in:** 1.3.1 (Update to 1.3.1 or later.)
- **Severity:** Medium 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-22)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/mortgage-calculator
- **Fix released:** 2026-10-21
- **Published:** 2026-10-22
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1423/

## Description

The Mortgage Calculator plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title' attribute of the 'mortgage_calculator' shortcode in all versions up to, and including, 1.3.0, due to insufficient input sanitization and output escaping on the user-supplied attribute. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

## References

- https://wpsec.com/vuln/WPSEC-2026-1423/
- https://plugins.svn.wordpress.org/mortgage-calculator/tags/1.3.1/
- https://wordpress.org/plugins/mortgage-calculator/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1423/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.