mailform vulnerable to PHP code execution


mailform provided by keitai-site.net is a PHP script providing a mail form function to a website.
mailform contains a PHP code execution vulnerability (CWE-94) on the server where the product is running.

During the meeting of Committee for authorizing the disclosure of unresolved vulnerabilities held on January 16, 2020, it was judged that an advisory for this vulnerability shall be disclosed since all the criteria and conditions described below which are stated in Standards for Handling Vulnerability related Information of Software Products and Other and Information Security Early Warning Partnership Guideline have been satisfied.

1. The developer of the product is unreachable:
2. Existence of vulnerability has been verified:
3. Not disclosing this case may result in the risk that product users will have no means to know of the existence of the vulnerability in the product:
4. There are no particular reasons that would make disclosure inappropriate:
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 7.3 (High) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: Low
CVSS V2 Severity:
Base Metrics 7.5 (High) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Low
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: Partial
Affected Products

  • Mail Form 1.04

The above is the software product and version that have been reported.

Arbitrary PHP code may be executed on the server where the product is running.

[Consider stop using mailform version 1.04]
Since the developer was unreachable, existence of any mitigations is unknown.
Vendor Information

CWE (What is CWE?)

  1. Code Injection(CWE-94) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2020-5553

  1. JVN : JVN#77634892
  2. National Vulnerability Database (NVD) : CVE-2020-5553
Revision History

  • [2020/03/24]
      Web page was published