← Vulnerability feed

Vulnerability record · CVE-2021-41749 · published 12 June 2022

CVE-2021-41749: Nystudio107 seomatic code injection vulnerability

Nystudio107 · Seomatic

In the SEOmatic plugin up to 3.4.11 for Craft CMS 3, it is possible for unauthenticated attackers to perform a Server-Side Template Injection, allowing for remote code execution.

9.8 CVSS 3.1 Critical EPSS 18% · top 2.9% CWE-94 · Code injection
9.8CVSS 3.1 base score, v2 7.5
18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

In the SEOmatic plugin up to 3.4.11 for Craft CMS 3, it is possible for unauthenticated attackers to perform a Server-Side Template Injection, allowing for remote code execution.

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/blob/develop/CHANGELOG.md Release NotesThird Party Advisory
https://github.com/nystudio107/craft-seomatic/commit/3fee7d50147cdf3f999cfc1e04cbc3fb3d9f2f7d PatchThird Party Advisory
https://github.com/nystudio107/craft-seomatic/blob/develop/CHANGELOG.md Release NotesThird Party Advisory
https://github.com/nystudio107/craft-seomatic/commit/3fee7d50147cdf3f999cfc1e04cbc3fb3d9f2f7d PatchThird Party Advisory

Track CVE-2021-41749 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

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

9.8CVE-2021-44618Nystudio107 seomatic code injection vulnerabilityA Server-side Template Injection (SSTI) vulnerability exists in Nystudio107 Seomatic 3.4.12 in src/helpers/UrlHelper.php via the host header.EPSS 1.4%7.5CVE-2020-12790Nystudio107 seomatic injection vulnerabilityIn 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 In…EPSS 2.2%7.5CVE-2018-14716Nystudio107 seomatic code injection vulnerabilityA 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 eleme…EPSS 33%6.1CVE-2021-41750Nystudio107 seomatic cross-site scripting vulnerabilityA cross-site scripting (XSS) vulnerability in the SEOmatic plugin 3.4.10 for Craft CMS 3 allows remote attackers to inject arbitrary web script via a…EPSS 1.1%8.8CVE-2026-65660Microsoft sharepoint server code injection vulnerabilityImproper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.KEVEPSS 2.1%9.8CVE-2026-60004Gitea diffpatch API code injection enables remote code executionGitea before 1.27.1 allows remote code execution through the diffpatch API by way of Git hook installation. The flaw is a code injection issue (CWE-9…KEVEPSS 24%analysed9.5CVE-2026-72530TrueConf Server sandbox breakout via crafted script code injectionTrueConf Server versions 5.3.X through 5.3.9, 5.4.X through 5.4.9, 5.5.X through 5.5.5 and earlier allow a remote unauthenticated attacker to break o…KEVEPSS 1.7%analysed9.4CVE-2025-62593Ray browser-based RCE via insufficient User-Agent guardRay, an AI compute engine, contains a critical remote code execution flaw before version 2.52.0. Its defense against browser-based attacks relies on …KEVEPSS 62%analysed

Source: NIST National Vulnerability Database (record CVE-2021-41749), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.