# CVE-2026-115479: baserCMS email field address validation bypass

Source: https://junglewise.ai/threats/cve-2026-115479-basercms-is-a-website-development-framework-in-versions-5-2-5  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-23. Updated: 2026-10-23  
License: CC BY 4.0 with a link back

CVE-2026-115479 · Severity: medium · CVSS 5.3 · Published 2026-10-23

baserCMS is a website content management system that includes a mail form feature allowing visitor contact. An unauthenticated attacker can bypass email validation in form fields by supplying comma-separated email addresses, causing auto-reply messages to be sent to multiple unintended recipients using the site's identity. This enables abuse of the site's email infrastructure for unsolicited mail campaigns to third parties.

Technologies: [Baserproject baserCMS](https://junglewise.ai/threats/technologies/baserproject-basercms-1). Vendors: [Baserproject](https://junglewise.ai/threats/vendors/baserproject).

## Quick answers

**Is CVE-2026-115479 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-115479 being exploited in the wild.

**How severe is CVE-2026-115479?** Medium severity, with a CVSS score of 5.3, published 23 October 2026.

**Which products and versions are affected?** Baserproject baserCMS 5.2.5–5.3.1, 5.4.0–5.4.1.

**Is there a fix for CVE-2026-115479?** Yes: fixed in baserCMS 5.3.2, 5.4.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-115479 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-115479?** Check whether you run Baserproject baserCMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in baserCMS 5.3.2, 5.4.2

## Technical details

The vulnerability exists in MailMessageMailer::sendFormToUser() which parses email field input via explode(',') without proper validation, sending auto-replies to all resulting addresses. The issue affects forms with email-type fields when the optional VALID_EMAIL server-side validation is not enabled; browser-level type=email validation is bypassed by crafted POST requests. The bundled contact form includes VALID_EMAIL and is unaffected; the fix enforces mandatory email format validation on email-type fields regardless of configuration.

## Affected products

- baserproject baserCMS 5.2.5–5.3.1, 5.4.0–5.4.1

## Timeline

- 2026-10-23: disclosed: CVE-2026-115479 published
- 2026-10-22: patched: Fix committed to 5.3.x and 5.4.x branches

## References

- [https://github.com/baserproject/basercms/commit/99e6257c9d5e2fa2bff2351defcb9fb37f69daf1](https://github.com/baserproject/basercms/commit/99e6257c9d5e2fa2bff2351defcb9fb37f69daf1)
- [https://github.com/baserproject/basercms/releases/tag/5.3.2](https://github.com/baserproject/basercms/releases/tag/5.3.2)

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