CVE-2026-107843
- Source
- https://cve.org/CVERecord?id=CVE-2026-107843
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107843.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-107843
- Aliases
- Published
- 2026-10-09T19:21:32Z
- Modified
- 2026-10-28T02:30:37Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
- Summary
- Contao: The registration module re-sends activation mails on any unauthenticated POST, with no throttle and no captcha check
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-204", "CWE-770" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107843.json" }- References
-
- https://github.com/contao/contao/releases/tag/5.3.50
- https://github.com/contao/contao/releases/tag/5.7.12
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107843.json
- https://github.com/contao/contao/security/advisories/GHSA-mfxh-vp55-7gc6
- https://nvd.nist.gov/vuln/detail/CVE-2026-107843
- https://github.com/contao/contao/commit/2ea6117f9049db7221679251cfc41e67d941a74b
Affected packages
Git / github.com/contao/contao
Affected ranges
- Type
- GIT
- Repo
- https://github.com/contao/contao
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "4.1.0" }, { "fixed": "5.3.50" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "introduced": "5.4.0-RC1" }, { "fixed": "5.7.12" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "2ea6117f9049db7221679251cfc41e67d941a74b" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "5.3.50", "range": [ { "fixed": "a11109b60dedcbd99e32a4e8550afdadb500f2c5" } ], "source": "REFERENCES_TAG" }, { "original_tag": "5.7.12", "range": [ { "fixed": "a6543f49a92187a7368f51b290179c4795386e23" } ], "source": "REFERENCES_TAG" } ] }