Description

Unauthenticated Cross Site Scripting (XSS) in 12 Step Meeting List <= 3.19.16 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-08-24T12:16:52.543Z",
  "pubdate": "2026-08-24T12:16:52.543Z",
  "executiveSummary": "An unauthenticated Cross-Site Scripting (XSS) vulnerability has been identified in the 12 Step Meeting List plugin affecting versions 3.19.16 and prior. This security flaw enables remote attackers to inject malicious client-side scripts, typically JavaScript, into web pages rendered to unsuspecting users visiting the affected WordPress sites. The primary impact of this vulnerability includes session hijacking, credential theft, defacement of the web application interface, and redirection of users to malicious external domains. Because the vulnerability is unauthenticated, threat actors require no prior access, privileges, or user interaction beyond tricking a victim into executing the payload or visiting a crafted URL, thereby significantly lowering the barrier to exploitation. The risk implication is severe for organizations utilizing the vulnerable software, as compromised user sessions can lead to administrative privilege escalation depending on the victim's permission level. Immediate remediation is necessary to prevent arbitrary code execution within the context of the user's browser session, safeguarding application integrity and user trust.",
  "technicalDetails": "The identified vulnerability stems from improper neutralization of user-supplied input before rendering it back to the client, a classic root cause for Cross-Site Scripting (XSS) flaws. Specifically, within the vulnerable versions of the 12 Step Meeting List plugin (<= 3.19.16), HTTP request parameters or stored database fields containing malicious markup are improperly sanitized, escaped, or validated prior to output generation. The attack vector is network-based and exposed over standard web protocols (HTTP/HTTPS), allowing unauthenticated remote threat actors to craft malicious payloads embedded within URL parameters or input fields. The attack flow begins when an attacker crafts a malicious HTTP request containing executable JavaScript or HTML payloads directed at the vulnerable endpoints of the 12 Step Meeting List application. Due to the absence of robust output encoding mechanisms within the rendering functions of the vulnerable component, the application incorporates the unvalidated input directly into the Document Object Model (DOM) of the HTTP response. When a victim's browser parses the server response, the malicious script executes within the security context of the victim's session, bypassing standard same-origin policy constraints regarding the vulnerable domain. Post-exploitation impact encompasses the complete compromise of the user's browser session, enabling the extraction of sensitive session cookies, authorization tokens, and personal identifiable information (PII). Furthermore, the attacker can leverage the executing script to perform unauthorized actions on behalf of the authenticated user, modify webpage content to capture credentials via phishing overlays, or pivot further into the internal web application architecture. No authentication or privilege requirements are mandated to deliver the payload, exposing the application to broad-scale automated scanning and exploitation campaigns across the internet."
}