Contao: The registration module re-sends activation mails

ModuleRegistration::compile reaches its follow-up registration branch on any POST to a page carrying the module. That branch checks neither FORMSUBMIT nor the captcha result computed immediately above it, and resendActivationMail leads to OptInToken::send, which has no rate limit at all. Impact...

CVE-2026-107843

Contao is an Open Source CMS. From version 4.1.0 until 5.3.50 and 5.7.12, ModuleRegistration::compile enters its follow-up registration branch on any POST to a page containing the registration module without verifying FORMSUBMIT or the preceding captcha result. resendActivationMail can then invok...

CVE-2026-107843

The Contao Open Source CMS (versions 4.1.0 through 5.3.50 and 5.7.12 ) contains a vulnerability where the ModuleRegistration::compile() function fails to verify FORM_SUBMIT or captcha results on unauthenticated POST requests. This allows an unauthenticated attacker to trigger the resendActivation...

CVE-2026-107843 Contao: The registration module re-sends activation mails on any unauthenticated POST, with no throttle and no captcha check

Contao is an Open Source CMS. From version 4.1.0 until 5.3.50 and 5.7.12, ModuleRegistration::compile enters its follow-up registration branch on any POST to a page containing the registration module without verifying FORMSUBMIT or the preceding captcha result. resendActivationMail can then invok...

EUVD-2026-95973

Contao is an Open Source CMS. From version 4.1.0 until 5.3.50 and 5.7.12, ModuleRegistration::compile enters its follow-up registration branch on any POST to a page containing the registration module without verifying FORMSUBMIT or the preceding captcha result. resendActivationMail can then invok...