Read the docs
TI-2026-82317 Aliases CVE-2026-115303GHSA-ghmm-gqr3-xwc7

CRLF injection in Contact Form by Supsystic WordPress plugin

Priority LOW 17CWE-93Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

The Contact Form by Supsystic WordPress plugin before 1.11.1 does not strip CR/LF characters from submitted field values before placing them into outgoing email headers when a form maps a field to Reply-To, From or Cc. An unauthenticated attacker can inject additional headers, such as Bcc or Cc recipients, into the notification email (CWE-93). A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00224 13th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Contact Form by Supsystic (Unknown): 1.11.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownContact Form by Supsysticbefore 1.11.11.11.1Patch availableCNA
  • Contact Form by Supsystic VendorUnknown Affected before 1.11.1 Fixed in 1.11.1 Patch available CNA

Remediation

Update Contact Form by Supsystic to version 1.11.1, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA Contact Form by Supsystic (Unknown) Fixed in 1.11.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Contact Form by Supsystic 1.11.1

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2026-82310 Server-side template injection in Contact Form by Supsystic pluginPriority LOW 34
    • TI-2026-82311 Contact Form by Supsystic lets attackers delete statisticsPriority LOW 29
    • TI-2026-82308 CSRF in Contact Form by Supsystic lets attackers change mail settingsPriority LOW 23
    Show all 5 records →

Timeline

  1. 2026-10-29 Threatist record created from CVE-2026-115303
  2. 2026-10-29 Alias added: GHSA-ghmm-gqr3-xwc7
  3. 2026-10-29 Weakness changed · CISA ADP
  4. 2026-10-29 CISA SSVC decision points changed

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences