CVE-2020-12790 — In the SEOmatic plugin before 3

In the SEOmatic plugin before 3.2.49 for Craft CMS, helpers/DynamicMeta.php does not properly sanitize the URL. This leads to Server-Side Template Injection and credentials disclosure via a crafted Twig template after a semicolon.

01What is this vulnerability?

In the SEOmatic plugin before 3.2.49 for Craft CMS, helpers/DynamicMeta.php does not properly sanitize the URL. This leads to Server-Side Template Injection and credentials disclosure via a crafted Twig template after a semicolon.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2020-05-11T18:08:04.000Z
• Last modified: 2024-08-04T12:04:22.865Z

09References

• github.com — https://github.com/nystudio107/craft-seomatic/releases/tag/3.2.49
• github.com — https://github.com/nystudio107/craft-seomatic/blob/v3/CHANGELOG.md#3249---202003…
• isec.pl — https://isec.pl/en/vulnerabilities/isec-0028-seomatic-ssti-23032020.txt
• github.com — https://github.com/nystudio107/craft-seomatic/commit/82f4a25b28fd622393da6592dc9…