Which products and versions are affected by CVE-2020-9757?

Affected: Craft CMS (Craftcms); nystudio107/craft-seomatic (composer). The full list is in the CVE brief.

Is CVE-2020-9757 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Sep 19, 2024.

Is CVE-2020-9757 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2020-9757?

No public exploit code is known.

Is there a fix for CVE-2020-9757?

Fixed versions are available, including Craft CMS 3.3.0, nystudio107/craft-seomatic 3.3.0.

How urgently should CVE-2020-9757 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2020-9757

CriticalExploited

SEOmatic for CraftCMS allows Server-Side Template Injection

Published May 24, 2022 · Updated Aug 7, 2026 · Also known as GHSA-6q4j-8pjm-5mgc

Key Facts

Patch immediately

CVE-2020-9757 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Craft CMS (Craftcms), nystudio107/craft-seomatic (composer).
It is exploited in the wild, listed in Industry KEV feed since Sep 19, 2024. No public exploit code is known.
EPSS estimates a 73% probability of exploitation in the next 30 days.
Fixed versions are available, including Craft CMS 3.3.0, nystudio107/craft-seomatic 3.3.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

73%

Higher than 99.4% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing

Public exploit code

None known

Get the full CVE-2020-9757 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

The SEOmatic component before 3.3.0 for Craft CMS allows Server-Side Template Injection that leads to RCE via malformed data to the metacontainers controller.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Sep 19, 2024	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Craft CMSCraftcms	See advisory	3.3.0
nystudio107/craft-seomaticcomposer	See advisory	3.3.0

Patched Releases

Craft CMS

3.3.0

nystudio107/craft-seomatic

3.3.0

Timeline

Publicly disclosed
May 24, 2022
Added to Industry KEV feed
Sep 19, 2024
Last updated
Aug 7, 2026

Weakness Type

CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

References

5 more references in the full CVE brief

FAQ

Common Questions.

The SEOmatic component before 3.3.0 for Craft CMS allows Server-Side Template Injection that leads to RCE via malformed data to the metacontainers controller.
Affected: Craft CMS (Craftcms); nystudio107/craft-seomatic (composer). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Sep 19, 2024.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Craft CMS 3.3.0, nystudio107/craft-seomatic 3.3.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2020-9757 Running On Your Attack Surface?

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