Contact Form by Supsystic <= 1.11.0 — Unauthenticated Arbitrary Email Header Injection
CVE-2026-115303Published · Updated Action summary
Affected: ≤1.11.0Update to 1.11.1 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Required access
- No account needed
- Exploit prediction (EPSS)
- 0.2% chance in 30 days13th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
Contact Form by Supsystic – Drag & Drop Form Builder with Templates & Form Statistics contact-form-by-supsystic
- Affected≤ 1.11.0
- Patched in1.11.1
Update to 1.11.1 or newer.
You are affected if you run ≤ 1.11.0. Version 1.11.1 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Contact Form by Supsystic – Drag & Drop Form Builder with Templates & Form Statistics.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 1.11.1, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Contact Form by Supsystic – Drag & Drop Form Builder with Templates & Form Statistics to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Emirhan Sevmez.
The Contact Form by Supsystic plugin for WordPress is vulnerable to Email Header Injection in all versions up to, and including, 1.11.0. This is due to missing sanitization of CR/LF characters in user-controlled field values before concatenating them into outgoing email headers via utilsCfs::replaceVariables(). This makes it possible for unauthenticated attackers to inject arbitrary email headers, such as additional Bcc or Cc recipients, into outgoing notification emails sent by any configured contact form. A form must be configured to map a submitted field value into the Reply-To, From, or Cc email header.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Contact Form by Supsystic – Drag & Drop Form Builder with Templates & Form Statistics
All 21| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Unauthenticated Information Exposure ≤1.10.5Update to 1.10.7 | CVE-2026-115591 | |
| Medium5.3 | Missing Authorization ≤1.10.7Update to 1.11.1 | CVE-2026-115595 | |
| High7.2 | Authenticated (Administrator+) Remote Code Execution ≤1.11.0Update to 1.11.1 | CVE-2026-115301 | |
| Medium5.3 | Missing Authorization ≤1.11.0Update to 1.11.1 | CVE-2026-115302 | |
| Medium4.3 | Cross-Site Request Forgery ≤1.11.0Update to 1.11.1 | CVE-2026-115300 |
- Medium5.3Unauthenticated Information Exposure
≤1.10.5Update to 1.10.7
- Medium5.3Missing Authorization
≤1.10.7Update to 1.11.1
- High7.2Authenticated (Administrator+) Remote Code Execution
≤1.11.0Update to 1.11.1
- Medium5.3Missing Authorization
≤1.11.0Update to 1.11.1
- Medium4.3Cross-Site Request Forgery
≤1.11.0Update to 1.11.1
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.