CVE-2026-107843
CVE-2026-107843 · Contao: The registration module re-sends activation mails on any unauthenticated POST, with no throttle and no captcha check
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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.
CVSS 5.3 · Mittel · EPSS 0,3% · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Technologie-Stack: php
Betroffene Produkte und Versionen
contao
- Softwareversionen
- >= 4.1.0, < 5.3.50: Betroffen
- >= 5.4.0-RC1, < 5.7.12: Betroffen
Keine Korrektur veröffentlicht
contao/core-bundle Packagist
- Softwareversionen
- 4.1.0
- 4.1.1
- 4.1.2
- 4.1.3
- 4.10.0
- 4.10.0-RC1
- 4.10.0-RC2
- 4.10.0-RC3
- 4.10.0-RC4
- 4.10.1
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- 4.11.0
- 4.11.0-RC1
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- 4.12.0
- 4.12.0-RC1
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- 4.12.1
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- 4.12.3
- 4.12.4
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- 4.13.0
- 4.13.0-RC1
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- 4.13.1
- 4.13.10
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- 5.1.0-RC1
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- 5.3.0-RC1
- 5.3.0-RC2
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- 5.3.0-RC4
- 5.3.1
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- 5.3.8
- 5.3.9
- Betroffene Versionsbereiche
- ECOSYSTEM: ≥ 4.1.0, < 5.3.50
Auf 5.3.50 aktualisieren
contao/core-bundle Packagist
- Softwareversionen
- 5.4.0
- 5.4.0-RC1
- 5.4.0-RC2
- 5.4.0-RC3
- 5.4.0-RC4
- 5.4.1
- 5.4.10
- 5.4.11
- 5.4.12
- 5.4.13
- 5.4.14
- 5.4.2
- 5.4.3
- 5.4.4
- 5.4.5
- 5.4.6
- 5.4.7
- 5.4.8
- 5.4.9
- 5.5.0
- 5.5.0-RC1
- 5.5.0-RC2
- 5.5.0-RC3
- 5.5.0-RC4
- 5.5.1
- 5.5.10
- 5.5.11
- 5.5.12
- 5.5.13
- 5.5.14
- 5.5.15
- 5.5.16
- 5.5.2
- 5.5.3
- 5.5.4
- 5.5.5
- 5.5.6
- 5.5.7
- 5.5.8
- 5.5.9
- 5.6.0
- 5.6.0-RC1
- 5.6.0-RC2
- 5.6.0-RC3
- 5.6.1
- 5.6.10
- 5.6.11
- 5.6.2
- 5.6.3
- 5.6.4
- 5.6.5
- 5.6.6
- 5.6.7
- 5.6.8
- 5.6.9
- 5.7.0
- 5.7.0-RC1
- 5.7.0-RC2
- 5.7.0-RC3
- 5.7.0-RC4
- 5.7.1
- 5.7.10
- 5.7.11
- 5.7.2
- 5.7.3
- 5.7.4
- 5.7.5
- 5.7.6
- 5.7.7
- 5.7.8
- 5.7.9
- Betroffene Versionsbereiche
- ECOSYSTEM: ≥ 5.4.0-RC1, < 5.7.12
Auf 5.7.12 aktualisieren
Originalquellen
- https://github.com/contao/contao/security/advisories/GHSA-mfxh-vp55-7gc6
- https://github.com/contao/contao/commit/2ea6117f9049db7221679251cfc41e67d941a74b
- https://github.com/contao/contao/releases/tag/5.3.50
- https://github.com/contao/contao/releases/tag/5.7.12
- https://nvd.nist.gov/vuln/detail/CVE-2026-107843