Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in Pay
Date: 2023-04
Affected: rubygems/pay
Attack vector: xss
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2023-30614
CWE: CWE-79
CVSS: 7.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L)

### Impact A payments info page of Pay is susceptible to reflected Cross-site scripting. An attacker could create a working URL that renders a javascript link to a user on a Rails application that integrates Pay. This URL could be distributed via email to specifically target certain individuals. If the targeted application contains a functionality to submit user-generated content (such as comments) the attacker could even distribute the URL using that functionality. ### Patches This has been patched in version 6.3.2 and above. Pay will now sanitize the `back` parameter and only permit relative paths.


Mitigations:

Architectural layers (MAESTRO):