baserproject BaserCMS up to 5.3.1/5.4.1 Mail Form sendFormToUser userMail input validation

Summaryinfo

A vulnerability has been found in baserproject BaserCMS up to 5.3.1/5.4.1 and classified as problematic. This affects the function MailMessageMailer::sendFormToUser of the component Mail Form. The manipulation of the argument userMail leads to input validation. This vulnerability is traded as CVE-2026-115479. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in baserproject BaserCMS up to 5.3.1/5.4.1 and classified as problematic. This issue affects the function MailMessageMailer::sendFormToUser of the component Mail Form. The manipulation of the argument userMail with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is integrity. The summary by CVE is:

baserCMS is a website development framework. In versions 5.2.5 before 5.3.2 and 5.4.0 before 5.4.2, an unauthenticated visitor can supply a comma-separated address list in a public mail form's email field and cause a single auto-reply to be addressed to multiple third parties. MailMessageMailer::sendFormToUser() passes the visitor-controlled userMail value to parseAndNormalizeMailAddresses(), which splits it with explode(',') and supplies every resulting address to setTo(). Newly created forms with an email-type field are affected when the separate, optional VALID_EMAIL server-side validation is not enabled; browser type=email validation does not prevent crafted requests. The bundled contact form enables VALID_EMAIL and is not affected. The auto-reply uses the site's sender identity and includes partially attacker-controlled content, allowing abuse of the site to deliver unsolicited mail. This issue has been patched in versions 5.3.2 and 5.4.2.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-115479 since 10/22/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.3.2 or 5.4.2 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• baserproject

Name

• BaserCMS

Version

• 5.3.0
• 5.3.1
• 5.4.0
• 5.4.1

License

• open-source

Website

• Product: https://github.com/baserproject/basercms/

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