WPForms <= 1.10.2 - Improper Neutralization of CRLF Sequences to Unauthenticated Email Header Injection via Reply-To Display Name

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Summary

CVECVE-2026-12127
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-01 05:16:17 UTC
Updated2026-07-01 13:56:17 UTC
DescriptionThe WPForms – Easy Form Builder for WordPress – Contact Forms, Payment Forms, Surveys, & More plugin for WordPress is vulnerable to Improper Neutralization of CRLF Sequences ('CRLF Injection') in all versions up to, and including, 1.10.2 This is due to `get_reply_to_address()` processing the Reply-To display name through smart-tag expansion with context `'notification'` instead of `'notification-reply-to'`, which bypasses email-address validation while `wpforms_sanitize_textarea_field()` intentionally preserves CR/LF characters that are never stripped before the display name is concatenated into the raw `Reply-To:` mail header string. This makes it possible for unauthenticated attackers to inject arbitrary additional email headers — such as `Bcc:` — into outgoing notification emails, silently blind-copying all notification email copies to an attacker-controlled address. Exploitation requires that a form notification is configured to use a Paragraph Text (textarea) field as the Reply-To display name via a Smart Tag.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.003430000 probability, percentile 0.262610000 (date 2026-07-02)

Problem Types: CWE-93 | CWE-93 CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Smub WPForms AI Form Builder For WordPress Contact Forms Payment Forms Survey Form Quiz More affected 1.10.2 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wpforms-lite/tags/1.10.0.2/includes/fields/class-text... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wpforms-lite/tags/1.10.0.2/src/Emails/Notifications.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/d5a51c22-c4ca-4897-ad7e-c5df0... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/wpforms-lite/tags/1.10.1.1/src/Emails/Notifications.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wpforms-lite/tags/1.10.1.1/includes/fields/class-text... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset/3586095/wpforms-lite/trunk/src/Emails/Mailer.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wpforms-lite/tags/1.10.1.1/src/Emails/Mailer.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wpforms-lite/tags/1.10.1.1/src/Emails/Notifications.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wpforms-lite/tags/1.10.0.2/src/Emails/Mailer.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wpforms-lite/tags/1.10.0.2/src/Emails/Notifications.php [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Jack Pas (Dark.) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-06-12T15:48:56.000ZVendor Notified
CNA2026-06-30T16:02:50.000ZDisclosed
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