What’s Vulnerable › Vulnerabilities

CVE-2018-14716

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 32.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-08-06 · updated 2026-06-17
• Weakness: CWE-94

Description

A Server Side Template Injection (SSTI) was discovered in the SEOmatic plugin before 3.1.4 for Craft CMS, because requests that don't match any elements incorrectly generate the canonicalUrl, and can lead to execution of Twig code.

Affected products

• Nystudio107 Seomatic: before 3.1.4 — fixed in 3.1.4

How to fix

Upgrade to a fixed version: Nystudio107 Seomatic 3.1.4. Check the vendor advisory for mitigations.

References

• http://ha.cker.info/exploitation-of-server-side-template-injection-with-craft-cms-plguin-seomatic/
• https://github.com/nystudio107/craft-seomatic/commit/1e7d1d084ac3a89e7ec70620f2749110508d1ce1
• https://github.com/nystudio107/craft-seomatic/releases/tag/3.1.4
• https://twitter.com/nystudio107/status/1021847835418009605
• https://twitter.com/nystudio107/status/1021855169515057152
• https://www.exploit-db.com/exploits/45108/
• http://ha.cker.info/exploitation-of-server-side-template-injection-with-craft-cms-plguin-seomatic/
• https://github.com/nystudio107/craft-seomatic/commit/1e7d1d084ac3a89e7ec70620f2749110508d1ce1
• https://github.com/nystudio107/craft-seomatic/releases/tag/3.1.4
• https://twitter.com/nystudio107/status/1021847835418009605
• https://twitter.com/nystudio107/status/1021855169515057152
• https://www.exploit-db.com/exploits/45108/

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