CVE-2021-47870

Summary

GetSimple CMS My SMTP Contact Plugin 1.1.2 suffers from a Stored Cross-Site Scripting (XSS) vulnerability. The plugin attempts to sanitize user input using htmlspecialchars(), but this can be bypassed by passing dangerous characters as escaped hex bytes. This allows attackers to inject arbitrary client-side code that executes in the administrator's browser when visiting a malicious page.

Affected Software

Weaknesses

• CWE-79: CWE-79 Improper Neutralization of Input During Web Page Generation ('Stored Cross-site Scripting')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/boku7/gsSMTP-Csrf2Xss2RCE/
• http://get-simple.info
• https://github.com/GetSimpleCMS/GetSimpleCMS
• https://www.exploit-db.com/exploits/49798
• https://www.vulncheck.com/advisories/getsimple-cms-my-smtp-contact-plugin-stored-xss

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