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

CVE-2021-41750

Medium
6.1/10

Summary

A cross-site scripting (XSS) vulnerability in the SEOmatic plugin through 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.

  • LOW
  • NETWORK
  • LOW
  • CHANGED
  • REQUIRED
  • NONE
  • LOW
  • NONE

CWE-79 - Cross Site Scripting

Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.

References

Advisory Timeline

  • Published