---
id: CVE-2026-115480
title: 'baserCMS: Public Web API mail-form submission bypasses image CAPTCHA'
summary: >-
  baserCMS is a website development framework. In versions 5.0.0 before 5.3.2
  and 5.4.0 before 5.4.2, the public POST
  /baser/api/bc-mail/mail_messages/add/{mailContentId}.json endpoint accepts
  submissions without enforcing the form's auth_…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-799
  - CWE-693
vendor: baserproject
product: basercms
affected:
  - 'basercms >= 5.0.0, < 5.3.2'
  - 'basercms >= 5.4.0, < 5.4.2'
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T13:37:32.184Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115480'
references:
  - url: >-
      https://github.com/baserproject/basercms/security/advisories/GHSA-cpxq-6gjp-m59g
    label: >-
      https://github.com/baserproject/basercms/security/advisories/GHSA-cpxq-6gjp-m59g
  - url: >-
      https://github.com/baserproject/basercms/commit/3444154ca40f308ade8991e54459248f866dcf61
    label: >-
      https://github.com/baserproject/basercms/commit/3444154ca40f308ade8991e54459248f866dcf61
  - url: 'https://github.com/baserproject/basercms/releases/tag/5.3.2'
    label: 'https://github.com/baserproject/basercms/releases/tag/5.3.2'
  - url: 'https://github.com/baserproject/basercms/releases/tag/5.4.2'
    label: 'https://github.com/baserproject/basercms/releases/tag/5.4.2'
tags:
  - cve.org
ingestedAt: '2026-10-23T14:28:08.704Z'
---

## Overview

baserCMS is a website development framework. In versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, the public POST /baser/api/bc-mail/mail_messages/add/{mailContentId}.json endpoint accepts submissions without enforcing the form's auth_captcha setting. BcMail\Controller\Api\MailMessagesController::add() and MailMessagesService::create() omit the BcCaptchaService::check() verification of captcha_id and auth_captcha performed by MailController::submit() in the web UI. An unauthenticated attacker who can reach the API can therefore automate submissions without solving the enabled image challenge. The API disables FormProtection and has no rate limit; submissions can generate administrator-inbox spam, send attacker-influenced auto-replies to third parties when an email field is present, and accumulate mail_messages database records when save_info is enabled. The API already enforces the isAccepting() check added for CVE-2026-30878; the missing CAPTCHA check is a separate control failure. This issue has been patched in versions 5.3.2 and 5.4.2.

## Affected

- `basercms >= 5.0.0, < 5.3.2`
- `basercms >= 5.4.0, < 5.4.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.