CVE-2020-12790 json
SEOmatic for CraftCMS allows Server-Side Template Injection
published 2020-05-11 6 y ago modified 2026-06-17 4 mo ago also GHSA-23q7-59jj-2pj4 , EUVD-2022-1894
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.2%
- EPSS 2.2% chance of exploitation in 30 days, percentile 82%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist nystudio107/craft-seomatic 3.2.49
- nystudio107 seomatic 3.2.49
Exploit prediction
2.19% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- isec.pl https://isec.pl/en/vulnerabilities/isec-0028-seomatic-ssti-23032020.txt referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | nystudio107/craft-seomatic | <3.2.49 |
3.2.49 |
Classification
- Weakness
-
- CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component
References
-
github.com
/nystudio107/craft-seomatic/commit/82f4a25b28fd622393da6592dc9e5ccee7fc5be3#diff-52fd042c50432133a00a8f840f4a6
web, patch, third-party-advisory
-
github.com
/nystudio107/craft-seomatic/commit/82f4a25b28fd622393da6592dc9e5ccee7fc5be3
web
-
isec.pl
/en/vulnerabilities/isec-0028-seomatic-ssti-23032020.txt
web, exploit, third-party-advisory
-
github.com
/nystudio107/craft-seomatic/releases/tag/3.2.49
web, release-notes, third-party-advisory
-
github.com
/nystudio107/craft-seomatic/blob/v3/CHANGELOG.md#3249---20200324
web, release-notes, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-12790
advisory
-
github.com
/nystudio107/craft-seomatic
package
Sources
- CVE List CVE-2020-12790
- GitHub Advisory GHSA-23q7-59jj-2pj4
- NVD CVE-2020-12790
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.