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Not in CISA KEV
HIGH severity

CVE-2020-12790 — craft-seomatic

HIGHFix: nystudio107/craft-seomatic@82f4a25

CVE-2020-12790 is a high-severity (CVSS 7.5) 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.

SEOmatic for CraftCMS allows Server-Side Template Injection

Also known asGHSA-23q7-59jj-2pj4
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs83th percentile — riskier than 83% of all scored CVEsHighest risk
0.00%0.90%1.81%2.71%0.5%2.2%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

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistnystudio107/craft-seomaticall versions3.2.49composer require nystudio107/craft-seomatic:^3.2.49

Affected Products

1 product · 1 configurations
Application
seomaticnystudio107
< 3.2.49
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.

In the SEOmatic plugin before 3.2.49 for Craft CMS, helpers/DynamicMeta.…

isec.plNVDMay 2020

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 3.2.49 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-12790 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2020-12790: craft-seomatic — Fixed in 3.2.49