CVE-2021-41750 json
Cross-site Scripting in SEOmatic plugin
published 4y ago modified 4mo ago also GHSA-6hjc-m38h-7jhh , EUVD-2022-5962
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 66%
- public exploits
- 0
- none known
Summary
A cross-site scripting (XSS) vulnerability in the SEOmatic plugin 3.4.10 for Craft CMS 3 allows remote attackers to inject arbitrary web script via a GET to /index.php?action=seomatic/file/seo-file-link with url parameter containing the base64 encoded URL of a malicious web page / file and fileName parameter containing an arbitrary filename with the intended content-type to be rendered in the user's browser as the extension.
Patch / fix
- packagist nystudio107/craft-seomatic 3.4.11
Is CVE-2021-41750 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | nystudio107/craft-seomatic | <3.4.11 |
3.4.11 |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/nystudio107/craft-seomatic/commit/5f2cdc7c39e0a4bfb60d2f84131508f0a87b2873
web, patch, third-party-advisory
-
github.com
/nystudio107/craft-seomatic/commit/4e46b792ce973ac0c652fb330055f41aca1981c8
web, patch, third-party-advisory
-
github.com
/nystudio107/craft-seomatic/blob/develop/CHANGELOG.md
web, release-notes, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-41750
advisory
-
github.com
/nystudio107/craft-seomatic
package
Sources
- CVE List CVE-2021-41750
- GitHub Advisory GHSA-6hjc-m38h-7jhh
- NVD CVE-2021-41750
Fencer Intel 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.