CVE-2026-115480

Vulnerability Description

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.

CVSS Score

Related Weaknesses (CWE)

References

• https://github.com/baserproject/basercms/commit/3444154ca40f308ade8991e54459248f
• https://github.com/baserproject/basercms/releases/tag/5.3.2
• https://github.com/baserproject/basercms/releases/tag/5.4.2
• https://github.com/baserproject/basercms/security/advisories/GHSA-cpxq-6gjp-m59g
• https://github.com/baserproject/basercms/security/advisories/GHSA-cpxq-6gjp-m59g