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Fencer Vulns
critical 9.8

CVE-2020-9757 in the critical feed json

SEOmatic for CraftCMS allows Server-Side Template Injection

published 2020-03-04 6 y ago modified 2026-06-17 4 mo ago also GHSA-6q4j-8pjm-5mgc , EUVD-2022-2843

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
72.8%
EPSS 72.8% chance of exploitation in 30 days, percentile 99.4%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

  • packagist nystudio107/craft-seomatic 3.3.0
  • craftcms craft_cms 3.3.0

Exploit prediction

72.82% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Craft CMS < 3.3.0 - Server-Side Template Injection nuclei detection template
  • github.com https://github.com/giany/CVE/blob/master/CVE-2020-9757.txt referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist nystudio107/craft-seomatic
<3.3.0
3.3.0

Classification

Weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.