CVE-2024-11376:Reflected Cross-Site Scripting (XSS) in the s2Member WordPress plugin (<= 241216), caused by insufficient escaping when building URLs with add_query_arg, exploitable by unauthenticated attackers via crafted links that trick a user into performing an action.

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CVE-2024-11376 affects the s2Member plugin for WordPress (vendor: Clavaque) and is a reflected XSS vulnerability (CWE-79) present in all versions up to and including 241216. The flaw stems from using add_query_arg without proper escaping on URLs, enabling an unauthenticated attacker to inject arbitrary web scripts into pages that render the manipulated URL when a user is coaxed into performing an action, such as clicking a specially crafted link. The CVSS v3.1 base score is 6.1 (Medium), with the attack vector being network-based, requiring no privileges but user interaction, and resulting in a low impact on confidentiality and integrity (I:L, C:L) and no impact on availability. This makes the vulnerability particularly relevant for sites where users may be enticed to click manipulated links, potentially exposing session information or cookies in some contexts.

Overview

This CVE concerns a reflected XSS vulnerability in the s2Member plugin for WordPress caused by insufficient escaping in URL construction via add_query_arg. The issue affects all versions up to 241216 and can be exploited by an unauthenticated attacker who tricks a user into clicking a crafted link, leading to script execution in the victim’s browser. The vulnerability is classified as CWE-79 with a CVSS v3.1 base score of 6.1 (Medium).

Remediation

  • Update the s2Member plugin to the latest available version that contains the fix. Check the vendor’s advisories and the WordPress plugin page for the exact patched release.
  • If a patch is not yet available, temporarily disable or uninstall the s2Member plugin to mitigate exposure until a fix is released.
  • Implement compensating controls:
    • Enable a Web Application Firewall (WAF) with rules that detect and block reflected XSS patterns and suspicious add_query_arg usage.
    • Apply a strict Content Security Policy (CSP) to restrict inline scripts and trusted sources, reducing the impact of potential XSS.
    • Harden input/output handling on pages that render user-supplied query parameters, and ensure proper escaping for any data reflected in the UI.
  • Monitor vendor advisories and CVE databases for updates and confirm patch availability.
  • After applying remediation, test to verify the vulnerability is mitigated and conduct a regression test to ensure normal plugin functionality.

References

Industry ExposureMost to least
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.

  1. Accommodation & Food Services: Low
    Accommodation & Food Services
  2. Administrative, Support, Waste Management & Remediation Services: Low
    Administrative, Support, Waste Management & Remediation Services
  3. Agriculture, Forestry Fishing & Hunting: Low
    Agriculture, Forestry Fishing & Hunting
  4. Arts, Entertainment & Recreation: Low
    Arts, Entertainment & Recreation
  5. Construction: Low
    Construction
  6. Educational Services: Low
    Educational Services
  7. Finance and Insurance: Low
    Finance and Insurance
  8. Health Care & Social Assistance: Low
    Health Care & Social Assistance
  9. Information: Low
    Information
  10. Management of Companies & Enterprises: Low
    Management of Companies & Enterprises
  11. Manufacturing: Low
    Manufacturing
  12. Mining: Low
    Mining
  13. Other Services (except Public Administration): Low
    Other Services (except Public Administration)
  14. Professional, Scientific, & Technical Services: Low
    Professional, Scientific, & Technical Services
  15. Public Administration: Low
    Public Administration
  16. Real Estate Rental & Leasing: Low
    Real Estate Rental & Leasing
  17. Retail Trade: Low
    Retail Trade
  18. Transportation & Warehousing: Low
    Transportation & Warehousing
  19. Utilities: Low
    Utilities
  20. Wholesale Trade: Low
    Wholesale Trade

Focus on What Matters

  1. See Everything.
  2. Identify True Risk.
  3. Proactively Mitigate Threats.

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