Live › vulnerability › CVE-2026-115480
Go to dashboardThe public mail message API in baserCMS accepts form submissions without checking the form's CAPTCHA, so a bot can submit forms without solving the challenge. An attacker can flood the administrator inbox, trigger auto-replies to third parties, and fill the database with mail message records.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Sites running baserCMS 5.0.0 through 5.3.x before 5.3.2, or 5.4.0 through 5.4.x before 5.4.2, that have a mail form with CAPTCHA enabled and a reachable API endpoint. Sites on patched versions or without the mail plugin's form API exposed can skip it.
No product ranges from the sources yet.
composer show basercms/basercms or the version shown in the admin footer; versions 5.0.0 to before 5.3.2 and 5.4.0 to before 5.4.2 are affected./baser/api/bc-mail/mail_messages/add/{mailContentId}.json.5.3.2 on the 5.3 line or 5.4.2 on the 5.4 line./baser/api/bc-mail/mail_messages/add/ endpoint at the web server or WAF.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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