CVE-2018-14716Seomatic Code Injection
SEOmatic plugin for Craft CMS SSTI Vulnerability
Published May 13, 2022 · Updated Jul 8, 2026 · Also known as GHSA-6j9m-rp7m-3gfg
Key Facts
Patch immediately- CVE-2018-14716 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Seomatic (Nystudio107), nystudio107/craft-seomatic (composer).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 33% probability of exploitation in the next 30 days.
- Fixed versions are available, including Seomatic 3.1.4, nystudio107/craft-seomatic 3.1.4.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (30-day exploit likelihood)
33%
Higher than 98.3% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
46/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2018-14716
- advisoryhttp://ha.cker.info/exploitation-of-server-side-template-injection-with-craft-cms-plguin-seomatic/
- advisoryGHSA advisory
- advisoryhttps://github.com/nystudio107/craft-seomatic/commit/1e7d1d084ac3a89e7ec70620f2749110508d1ce1
- advisoryhttps://twitter.com/nystudio107/status/1021847835418009605
- advisoryhttps://twitter.com/nystudio107/status/1021855169515057152
Description
A Server Side Template Injection (SSTI) was discovered in the SEOmatic plugin before 3.1.4 for Craft CMS, because requests that don't match any elements incorrectly generate the canonicalUrl, and can lead to execution of Twig code.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SeomaticNystudio107 | See advisory | 3.1.4 |
| nystudio107/craft-seomaticcomposer | See advisory | 3.1.4 |
Patched Releases
Seomatic
3.1.4
nystudio107/craft-seomatic
3.1.4
Timeline
Publicly disclosed
May 13, 2022
Last updated
Jul 8, 2026
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- advisorynvd.nist.gov · CVE-2018-14716
- advisoryha.cker.info · exploitation-of-server-side-template-injection-…
- advisoryGHSA advisory
- advisorygithub.com · 1e7d1d0
- advisorytwitter.com · 1021847835418009605
FAQ
Common Questions.
A Server Side Template Injection (SSTI) was discovered in the SEOmatic plugin before 3.1.4 for Craft CMS, because requests that don't match any elements incorrectly generate the canonicalUrl, and can lead to execution of Twig code.
Affected: Seomatic (Nystudio107); nystudio107/craft-seomatic (composer). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Seomatic 3.1.4, nystudio107/craft-seomatic 3.1.4.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2018-14716 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
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