# CVE-2020-12790: SEOmatic for CraftCMS allows Server-Side Template Injection

> Attackers can execute arbitrary code and disclose credentials via Server-Side Template Injection in the SEOmatic plugin for Craft CMS.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 11 May 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-23q7-59jj-2pj4

## What is CVE-2020-12790?

CVE-2020-12790 is a high-severity code injection vulnerability in n/a, published on 11 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the SEOmatic plugin before 3.2.49 for Craft CMS, helpers/DynamicMeta.php does not properly sanitize the URL. This leads to Server-Side Template Injection and credentials disclosure via a crafted Twig template after a semicolon.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2020-12790?

2 open source packages ship an affected version, including nystudio107/craft-seomatic. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `nystudio107/craft-seomatic` | Packagist | All versions | 3.2.49 |
| `nystudio107/craft-seomatic` | Packagist | All versions | 3.2.49 |

Products: Nystudio107 Seomatic.

## How do I fix CVE-2020-12790?

Upgrade nystudio107/craft-seomatic to 3.2.49 or later.

## Is CVE-2020-12790 being exploited?

There is no known exploitation of CVE-2020-12790 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-41749](https://insights.sbomify.com/CVE-2021-41749/): Code Injection in SEOmatic (critical 9.8)
- [CVE-2021-44618](https://insights.sbomify.com/CVE-2021-44618/): Server-side Template Injection in nystudio107/craft-seomatic (critical 9.8)
- [CVE-2018-14716](https://insights.sbomify.com/CVE-2018-14716/): SEOmatic plugin for Craft CMS SSTI Vulnerability (high 7.5)
- [CVE-2021-41750](https://insights.sbomify.com/CVE-2021-41750/): Cross-site Scripting in SEOmatic plugin (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-12790 and fix it if it is affected.

What it is: CVE-2020-12790 is a high-severity code injection vulnerability in n/a, published on 11 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-12790 in the wild and no public exploit code.

Affected packages and fixed versions:
- nystudio107/craft-seomatic (Packagist): affected all versions; fixed in 3.2.49
- nystudio107/craft-seomatic (Packagist): affected all versions; fixed in 3.2.49

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-12790/ (Markdown: https://insights.sbomify.com/CVE-2020-12790/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-12790
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-12790
- OSV: https://osv.dev/vulnerability/CVE-2020-12790

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-12790/
Summaries are generated and may contain mistakes; the official description above is the record.