The Contact Form by Supsystic WordPress plugin before 1.11.1 does not strip CR/LF characters or re-validate submitted field values before concatenating them into outgoing email headers when a form is configured to map a submitted field into its Reply-To, From or Cc header, allowing unauthenticated users to inject arbitrary email headers such as additional Bcc or Cc recipients into the notification email.

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Fixes

Solution

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Workaround

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History

Thu, 29 Oct 2026 11:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 29 Oct 2026 11:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-93

Thu, 29 Oct 2026 08:30:00 +0000

Type Values Removed Values Added
Description The Contact Form by Supsystic WordPress plugin before 1.11.1 does not strip CR/LF characters or re-validate submitted field values before concatenating them into outgoing email headers when a form is configured to map a submitted field into its Reply-To, From or Cc header, allowing unauthenticated users to inject arbitrary email headers such as additional Bcc or Cc recipients into the notification email.
Title Contact Form by Supsystic < 1.11.1 - Unauthenticated CRLF / Email Header Injection via Reply-To Field Mapping
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: WPScan

Published:

Updated: 2026-10-29T10:45:50.346Z

Reserved: 2026-10-22T09:43:40.292Z

Link: CVE-2026-115303

cve-icon Vulnrichment

Updated: 2026-10-29T10:42:57.217Z

cve-icon NVD

Status : Received

Published: 2026-10-29T09:17:08.097

Modified: 2026-10-29T11:17:29.807

Link: CVE-2026-115303

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T11:00:16Z

Weaknesses