{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-107843", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-08T22:34:49.291Z", "datePublished": "2026-10-09T19:21:32.011Z", "dateUpdated": "2026-10-13T17:08:23.664Z"}, "containers": {"cna": {"title": "Contao: The registration module re-sends activation mails on any unauthenticated POST, with no throttle and no captcha check", "problemTypes": [{"descriptions": [{"cweId": "CWE-204", "lang": "en", "description": "CWE-204: Observable Response Discrepancy", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/contao/contao/security/advisories/GHSA-mfxh-vp55-7gc6", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/contao/contao/security/advisories/GHSA-mfxh-vp55-7gc6"}, {"name": "https://github.com/contao/contao/commit/2ea6117f9049db7221679251cfc41e67d941a74b", "tags": ["x_refsource_MISC"], "url": "https://github.com/contao/contao/commit/2ea6117f9049db7221679251cfc41e67d941a74b"}, {"name": "https://github.com/contao/contao/releases/tag/5.3.50", "tags": ["x_refsource_MISC"], "url": "https://github.com/contao/contao/releases/tag/5.3.50"}, {"name": "https://github.com/contao/contao/releases/tag/5.7.12", "tags": ["x_refsource_MISC"], "url": "https://github.com/contao/contao/releases/tag/5.7.12"}], "affected": [{"vendor": "contao", "product": "contao", "versions": [{"version": ">= 4.1.0, < 5.3.50", "status": "affected"}, {"version": ">= 5.4.0-RC1, < 5.7.12", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-09T19:21:32.011Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-mfxh-vp55-7gc6", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-13T17:08:09.326334Z", "id": "CVE-2026-107843", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-13T17:08:23.664Z"}}]}}

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{}