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CVE-2020-9757

81
FAUCET Score

CVE-2020-9757 describes a critical Server-Side Template Injection vulnerability in the SEOmatic component of Craft CMS versions prior to 3.3.0. This flaw allows an unauthenticated attacker to achieve Remote Code Execution by sending specially crafted data to the metacontainers controller. With a CVSS score of 9.8 (Critical) and an EPSS score indicating high exploitability, this vulnerability poses a significant risk. While not currently listed in CISA's KEV catalog, public exploit intelligence includes Nuclei templates, and the vulnerability has garnered substantial community discussion, suggesting active interest in its exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.3.0CPE matchmatch criteria
cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
73.43%
Probability of exploitation in next 30 days
EPSS Percentile
99.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Nuclei: CVE-2020-9757 · Jul 4, 2020
This CVE's current EPSS score of 0.7343 is in the 98th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: nystudio107/craft-seomaticFixed in: 3.3.0
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-6q4j-8pjm-5mgccritical

SEOmatic for CraftCMS allows Server-Side Template Injection

May 24, 2022

References

github.com / giany/CVE/blob/master/CVE-2020-9757.txt
ExploitThird Party Advisory
github.com / nystudio107/craft-seomatic/blob/v3/CHANGELOG.md
Release NotesThird Party Advisory
github.com / nystudio107/craft-seomatic/commit/65ab659cb6c914c7ad671af1e417c0da2431f79b
PatchThird Party Advisory
github.com / nystudio107/craft-seomatic/commit/a1c2cad7e126132d2442ec8ec8e9ab43df02cc0f
PatchThird Party Advisory