CVE-2020-9757

CRITICALNVD 9.89.8—Elevated

9.8

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.

CVSS v3: 9.8
EG Score: 9.8(high)
EPSS: 99.9%
KEV: Not listed

Published

March 4, 2020

Last Modified

November 21, 2024

References (8)

cve@mitrehttps://github.com/giany/CVE/blob/master/CVE-2020-9757.txt
cve@mitrehttps://github.com/nystudio107/craft-seomatic/blob/v3/CHANGELOG.md
cve@mitrehttps://github.com/nystudio107/craft-seomatic/commit/65ab659cb6c914c7ad671af1e417c0da2431f79b
cve@mitrehttps://github.com/nystudio107/craft-seomatic/commit/a1c2cad7e126132d2442ec8ec8e9ab43df02cc0f
af854a3a-2127-422b-91ae-364da2661108https://github.com/giany/CVE/blob/master/CVE-2020-9757.txt
af854a3a-2127-422b-91ae-364da2661108https://github.com/nystudio107/craft-seomatic/blob/v3/CHANGELOG.md
af854a3a-2127-422b-91ae-364da2661108https://github.com/nystudio107/craft-seomatic/commit/65ab659cb6c914c7ad671af1e417c0da2431f79b
af854a3a-2127-422b-91ae-364da2661108https://github.com/nystudio107/craft-seomatic/commit/a1c2cad7e126132d2442ec8ec8e9ab43df02cc0f

Affected Packages

(1 across 1 ecosystem)

Packagist(1)

Package	Vulnerable range	Fixed in	Dependents
nystudio107/craft-seomatic	3.0.0 ... 3.2.9 (150 versions)	3.3.0	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

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

Data Freshness Timeline

(refreshed 2× in last 7d / 6× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 07:05 UTCEG score recompute
2026-05-26 23:13 UTCOSV refresh

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Nucleihttp/cves/2020/CVE-2020-9757.yaml
First seen Jan 1, 2020
Craft CMS < 3.3.0 - Server-Side Template Injection
Open source ↗

Frequently asked(5)

What is CVE-2020-9757?

CVE-2020-9757 is a critical vulnerability published on March 4, 2020. 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.

When was CVE-2020-9757 disclosed?

CVE-2020-9757 was first published in the National Vulnerability Database on March 4, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-9757 actively exploited?

CVE-2020-9757 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-9757?

CVE-2020-9757 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2020-9757?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-9757, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2020-9757

📅 Published

🔄 Last Modified

🔗 References (8)