CVE-2026-12127 json
WPForms <= 1.10.2 - Improper Neutralization of CRLF Sequences to Unauthenticated Email Header Injection via Reply-To Display Name
published 4mo ago modified 4mo ago also EUVD-2026-40907
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
Summary
The 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.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
- smub WPForms – AI Form Builder for WordPress – Contact Forms, Payment Forms, Survey Form, Quiz & More
Classification
- Weakness
-
- CWE-93 Improper Neutralization of CRLF Sequences
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/d5a51c22-c4ca-4897-ad7e-c5df00b07fe0?source=cve
- plugins.trac.wordpress.org /browser/wpforms-lite/tags/1.10.1.1/src/Emails/Mailer.php#L368
- plugins.trac.wordpress.org /browser/wpforms-lite/tags/1.10.1.1/src/Emails/Notifications.php#L1098
- plugins.trac.wordpress.org /browser/wpforms-lite/tags/1.10.1.1/src/Emails/Notifications.php#L1138
- plugins.trac.wordpress.org /browser/wpforms-lite/tags/1.10.1.1/includes/fields/class-textarea.php#L326
- plugins.trac.wordpress.org /browser/wpforms-lite/tags/1.10.0.2/src/Emails/Mailer.php#L368
- plugins.trac.wordpress.org /browser/wpforms-lite/tags/1.10.0.2/src/Emails/Notifications.php#L1098
- plugins.trac.wordpress.org /browser/wpforms-lite/tags/1.10.0.2/src/Emails/Notifications.php#L1138
- plugins.trac.wordpress.org /browser/wpforms-lite/tags/1.10.0.2/includes/fields/class-textarea.php#L326
- plugins.trac.wordpress.org /changeset/3586095/wpforms-lite/trunk/src/Emails/Mailer.php
- plugins.trac.wordpress.org /changeset?old_path=%2Fwpforms-lite/tags/1.10.2&new_path=%2Fwpforms-lite/tags/1.10.2.1
Sources
- CVE List CVE-2026-12127
- NVD CVE-2026-12127
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.