{"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": "2026-10-09T19:21:32.011Z"}, "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"}}}}

{}

{"affected": [{"affectedData": [{"product": "contao", "vendor": "contao", "versions": [{"status": "affected", "version": ">= 4.1.0, < 5.3.50"}, {"status": "affected", "version": ">= 5.4.0-RC1, < 5.7.12"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-107843", "lastModified": "2026-10-09T20:17:10.167", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-09T20:17:10.167", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/contao/contao/commit/2ea6117f9049db7221679251cfc41e67d941a74b"}, {"source": "security-advisories@github.com", "url": "https://github.com/contao/contao/releases/tag/5.3.50"}, {"source": "security-advisories@github.com", "url": "https://github.com/contao/contao/releases/tag/5.7.12"}, {"source": "security-advisories@github.com", "url": "https://github.com/contao/contao/security/advisories/GHSA-mfxh-vp55-7gc6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-204"}, {"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.1.0,5.3.50)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.0-RC1,5.7.12)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "contao", "source": "cna", "vendor": "contao"}, "product": "contao", "vendor": "contao"}], "created": "2026-10-09T20:30:11.635174+00:00", "updated": "2026-10-09T20:30:11.829903+00:00", "vendors": ["contao", "contao$PRODUCT$contao"]}