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CRITICAL severity

SEOmatic for CraftCMS allows Server-Side Template InjectionGHSA-6q4j-8pjm-5mgc

CRITICALFix: nystudio107/craft-seomatic@65ab659

GHSA-6q4j-8pjm-5mgc is a critical-severity (CVSS 9.8) CWE-74 vulnerability in nystudio107/craft-seomatic. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for nystudio107/craft-seomatic — see the affected versions and patch details below.

Also known asCVE-2020-9757
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
72.8%probability of exploitation in next 30 days
Very High Risk0.00%
Lower risk than most CVEs99th percentile — riskier than 99% of all scored CVEsHighest risk
66.4%77.6%88.8%100.0%94.3%72.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘nystudio107/craft-seomatic

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

The Seomatic component before 3.2.46 for Craft CMS allows Server-Side Template Injection and information disclosure via malformed data to the metacontainers controller.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistnystudio107/craft-seomaticall versions3.3.0composer require nystudio107/craft-seomatic:^3.3.0

Affected Products

1 product · 1 configurations
Application
craft cmscraftcms
< 3.3.0
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The SEOmatic component before 3.3.0 for Craft CMS allows Server-Side Tem…

github.comNVDApr 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for nystudio107/craft-seomatic, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update nystudio107/craft-seomatic to 3.3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-6q4j-8pjm-5mgc is resolved across your whole dependency graph.

  3. Workarounds

    Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

How to detect GHSA-6q4j-8pjm-5mgc

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id ghsa-6q4j-8pjm-5mgc -u https://target
Template
Craft CMS < 3.3.0 - Server-Side Template Injection
Severity
critical
Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the server.
Remediation
Upgrade Craft CMS to version 3.3.0 or higher to mitigate this vulnerability.

Template by ProjectDiscovery nuclei-templates (dwisiswant0), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

The Seomatic component before 3.2.46 for Craft CMS allows Server-Side Template Injection and information disclosure via malformed data to the metacontainers controller.
O3 Security · Impact-Aware SCA

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SEOmatic for CraftCMS allows Server-Side Template…