CVE-2026-115303: low-severity vulnerability in Contact Form by Supsystic
Contact Form by Supsystic < 1.11.1 - Unauthenticated CRLF / Email Header Injection via Reply-To Field Mapping
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 3.7epss 0.2%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
Unknown · Contact Form by Supsysticpublic PoCs found — 1
cve_referencewpscan.com/vulnerability/c32e3ccd-84cb-42a4-a343-353a02ccb541/unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Contact Form by Supsystic
In the same product, most dangerous first.
CVE-2026-115301HIGHContact Form by Supsystic < 1.11.1 - Admin+ SSTI via Form Text BlockEPSS 0.4%CVE-2026-115302MEDIUMContact Form by Supsystic < 1.11.1 - Unauthenticated Arbitrary Statistics DeletionEPSS 0.2%CVE-2025-15705LOWContact Form by Supsystic < 1.8.0 - Admin+ Stored XSSEPSS 0.1%CVE-2026-115300MEDIUMContact Form by Supsystic < 1.11.1 - Contact Submission and Statistics Deletion via CSRFEPSS 0.1%CVE-2026-115299MEDIUMContact Form by Supsystic < 1.11.1 - Arbitrary Plugin Settings Update via CSRFEPSS 0.1%