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...

GHSA-MFXH-VP55-7GC6 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...

Allocation of Resources Without Limits or Throttling

Overview contao/core-bundle is an Open Source PHP Content Management System for people who want a professional website that is easy to maintain. Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the ModuleRegistration::compile process. An...

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...

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...

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...

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 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...

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...

PT-2026-109302

Name of the Vulnerable Software and Affected Versions Contao versions 4.1.0 through 5.3.49 Contao versions 5.7.0 through 5.7.11 Description An issue exists where the ModuleRegistration::compile function enters its follow-up registration branch on any POST request to a page containing the...

CVE-2026-107843: Observable Response Discrepancy

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...