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Vulnerability record · CVE-2018-14716 · published 6 August 2018

CVE-2018-14716: Nystudio107 seomatic code injection vulnerability

Nystudio107 · Seomatic

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.

7.5 CVSS 3.1 High EPSS 33% · top 1.7% CWE-94 · Code injection
7.5CVSS 3.1 base score, v2 5.0
33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://ha.cker.info/exploitation-of-server-side-template-injection-with-craft-cms-plguin-seomatic/ Third Party Advisory
https://github.com/nystudio107/craft-seomatic/commit/1e7d1d084ac3a89e7ec70620f2749110508d1ce1 Vendor Advisory
https://github.com/nystudio107/craft-seomatic/releases/tag/3.1.4 PatchVendor Advisory
https://twitter.com/nystudio107/status/1021847835418009605 Vendor Advisory
https://twitter.com/nystudio107/status/1021855169515057152 Vendor Advisory
https://www.exploit-db.com/exploits/45108/ ExploitThird Party AdvisoryVDB Entry
http://ha.cker.info/exploitation-of-server-side-template-injection-with-craft-cms-plguin-seomatic/ Third Party Advisory
https://github.com/nystudio107/craft-seomatic/commit/1e7d1d084ac3a89e7ec70620f2749110508d1ce1 Vendor Advisory
https://github.com/nystudio107/craft-seomatic/releases/tag/3.1.4 PatchVendor Advisory
https://twitter.com/nystudio107/status/1021847835418009605 Vendor Advisory
https://twitter.com/nystudio107/status/1021855169515057152 Vendor Advisory
https://www.exploit-db.com/exploits/45108/ ExploitThird Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-14716), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.