CVE-2026-107843
mediumContao is an Open Source CMS.
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 FORM_SUBMIT or the preceding captcha result. resendActivationMail() can then invoke OptInToken::send() without rate limiting, allowing an unauthenticated attacker to cause repeated activation emails to be sent to an address with a pending registration and to determine whether that pending registration exists. The branch is reachable only when reg_activate is enabled and the target has an unconfirmed registration and opt-in token. This issue is fixed in versions 5.3.50 and 5.7.12.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/contao/contao/commit/2ea6117f9049db7221679251cfc41e67d941a74b security-advisories@github.com
- https://github.com/contao/contao/releases/tag/5.3.50 security-advisories@github.com
- https://github.com/contao/contao/releases/tag/5.7.12 security-advisories@github.com
- https://github.com/contao/contao/security/advisories/GHSA-mfxh-vp55-7gc6 security-advisories@github.com