Vulnerability CVE-2021-41750
Published: 2022-06-12

Description:
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.

Type:

CWE-79

 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Nystudio107 -> Seomatic 

 References:
https://github.com/nystudio107/craft-seomatic/blob/develop/CHANGELOG.md
https://github.com/nystudio107/craft-seomatic/commit/4e46b792ce973ac0c652fb330055f41aca1981c8
https://github.com/nystudio107/craft-seomatic/commit/5f2cdc7c39e0a4bfb60d2f84131508f0a87b2873
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