A Server Side Template Injection (SSTI) was discovered in the SEOmatic plugin before…
Priority MEDIUM 57CWE-94Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-94.
Summary
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.
Why it matters now
EPSS 0.32673 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix Fixed nystudio107/craft-seomatic (Packagist): 3.1.4
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | nystudio107/craft-seomatic (Packagist) | before 3.1.4 | 3.1.4 | Patch available | GHSA-6j9m-rp7m-3gfg |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- nystudio107/craft-seomatic (Packagist) Vendor— Affected before 3.1.4 Fixed in 3.1.4 Patch available GHSA-6j9m-rp7m-3gfg
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nystudio107:seomatic:*:*:*:*:*:craft_cms:*:* | before 3.1.4 | Vulnerable | Nystudio107 |
- cpe:2.3:a:nystudio107:seomatic:*:*:*:*:*:craft_cms:*:* Versions before 3.1.4 Vulnerable ·Nystudio107
Remediation
- Fix · GHSA-6j9m-rp7m-3gfg nystudio107/craft-seomatic (Packagist) Fixed in 3.1.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2018-14716
- 2026-10-03 Alias added: GHSA-6j9m-rp7m-3gfg
References
Exploit 1
Advisory 5
- https://twitter.com/nystudio107/status/1021855169515057152
- http://ha.cker.info/exploitation-of-server-side-template-injection-with-craft-cms-plguin-seomatic/
- https://twitter.com/nystudio107/status/1021847835418009605
- https://github.com/nystudio107/craft-seomatic/commit/1e7d1d084ac3a89e7ec70620f2749110508d1ce1
- https://nvd.nist.gov/vuln/detail/CVE-2018-14716
More Nystudio107 Seomatic vulnerabilities
- TI-2021-18401 In the SEOmatic plugin up to 3.4.11 for Craft CMS 3, it is possible for unauthenticated… CVSS 3.1CRITICAL 9.8
- TI-2021-20172 A Server-side Template Injection (SSTI) vulnerability exists in Nystudio107 Seomatic… CVSS 3.1CRITICAL 9.8
- TI-2020-10174 In the SEOmatic plugin before 3.2.49 for Craft CMS, helpers/DynamicMeta.php does not… CVSS 3.1HIGH 7.5
- TI-2021-18402 A cross-site scripting (XSS) vulnerability in the SEOmatic plugin 3.4.10 for Craft CMS 3… CVSS 3.1MEDIUM 6.1
Sources
- CVE-2018-14716 · CVE Program
- CVE-2018-14716 · NVD
- FIRST EPSS
- GHSA-6j9m-rp7m-3gfg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences