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CVE-2021-44618

29
FAUCET Score

CVE-2021-44618 describes a critical Server-side Template Injection (SSTI) vulnerability in Nystudio107 Seomatic version 3.4.12, specifically within the src/helpers/UrlHelper.php file, exploitable via the host header. This vulnerability carries a CVSS score of 9.8 (Critical), indicating it can be exploited remotely without authentication and has the potential for complete compromise of confidentiality, integrity, and availability. Despite its severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.4.12CPE matchmatch criteria
cpe:2.3:a:nystudio107:seomatic:3.4.12:*:*:*:*: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
1.37%
Probability of exploitation in next 30 days
EPSS Percentile
69.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0137 is in the 56th percentile among its peer group of 36,862 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: 3.4.12
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-m3xv-x3ph-mq22high

Server-side Template Injection in nystudio107/craft-seomatic

Mar 12, 2022

References

github.com / nystudio107/craft-seomatic/commit/0c5c0c0e0cb61000d12ec55ebf174745a5bf6469
PatchThird Party Advisory
github.com / nystudio107/craft-seomatic/releases/tag/3.4.12
Release NotesThird Party Advisory