{
    "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"
                }
            }
        ]
    }
}