{"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"}}]}}