Email Header Injection Vulnerability in Contact Form by Supsystic for WordPress
CVE-2026-115303

3.7LOW

Key Information:

Vendor

WordPress
Status
Contact Form By Supsystic
Vendor
CVE Published:
29 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-115303?

The Contact Form by Supsystic plugin for WordPress, prior to version 1.11.1, is susceptible to email header injection due to improper handling of CR/LF characters in user submissions. This flaw allows unauthenticated attackers to inject arbitrary email headers into outgoing notification emails. Specifically, when form fields are incorrectly mapped to the Reply-To, From, or Cc headers, attackers can manipulate email behavior by adding additional Bcc or Cc recipients, potentially leading to information disclosure.

Affected Version(s)

Contact Form by Supsystic 0 < 1.11.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-115303 - Proof of Concept

References

https://wpscan.com/vulnerability/c32e3ccd-84cb-42a4-a343-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
3.7
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Emirhan Sevmez
WPScan
.