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Vulnerability record · CVE-2021-44618 · published 11 March 2022

CVE-2021-44618: Nystudio107 seomatic code injection vulnerability

Nystudio107 · Seomatic

A Server-side Template Injection (SSTI) vulnerability exists in Nystudio107 Seomatic 3.4.12 in src/helpers/UrlHelper.php via the host header.

9.8 CVSS 3.1 Critical EPSS 1.4% · top 28.7% CWE-94 · Code injection
9.8CVSS 3.1 base score, v2 7.5
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

A Server-side Template Injection (SSTI) vulnerability exists in Nystudio107 Seomatic 3.4.12 in src/helpers/UrlHelper.php via the host header.

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

Affected products

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

References

LinkTags
https://github.com/nystudio107/craft-seomatic/commit/0c5c0c0e0cb61000d12ec55ebf174745a5bf6469 PatchThird Party Advisory
https://github.com/nystudio107/craft-seomatic/releases/tag/3.4.12 Release NotesThird Party Advisory
https://github.com/nystudio107/craft-seomatic/commit/0c5c0c0e0cb61000d12ec55ebf174745a5bf6469 PatchThird Party Advisory
https://github.com/nystudio107/craft-seomatic/releases/tag/3.4.12 Release NotesThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-44618), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.