A cross-site scripting (XSS) vulnerability in the SEOmatic plugin 3.4.10 for Craft CMS 3…
Priority LOW 29CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
A 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 GET to /index.php?action=seomatic/file/seo-file-link with url parameter containing the base64 encoded URL of a malicious web page / file and fileName parameter containing an arbitrary filename with the intended content-type to be rendered in the user's browser as the extension.
Why it matters now
EPSS 0.01126 66th percentileScored 2026-11-07
Fix Fixed nystudio107/craft-seomatic (Packagist): 3.4.11
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 3.4.11 | 3.4.11 | Patch available | GHSA-6hjc-m38h-7jhh |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- nystudio107/craft-seomatic (Packagist) Vendor— Affected before 3.4.11 Fixed in 3.4.11 Patch available GHSA-6hjc-m38h-7jhh
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nystudio107:seomatic:3.4.10:*:*:*:*:craft_cms:*:* | 3.4.10 | Vulnerable | Nystudio107 |
- cpe:2.3:a:nystudio107:seomatic:3.4.10:*:*:*:*:craft_cms:*:* Versions 3.4.10 Vulnerable ·Nystudio107
Remediation
- Fix · GHSA-6hjc-m38h-7jhh nystudio107/craft-seomatic (Packagist) Fixed in 3.4.11 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-41750
- 2026-10-03 Alias added: GHSA-6hjc-m38h-7jhh
References
Patch 2
Advisory 2
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-2018-10569 A Server Side Template Injection (SSTI) was discovered in the SEOmatic plugin before… CVSS 3.1HIGH 7.5
- 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
Sources
- CVE-2021-41750 · CVE Program
- CVE-2021-41750 · NVD
- FIRST EPSS
- GHSA-6hjc-m38h-7jhh · 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