| Título | October CMS 4.3.4 (4.x branch, up to commit c1876c7) Server-Side Request Forgery |
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| Descrição | An unauthenticated attacker can bypass the SSRF protection in the System\Classes\ResizeImages class of October CMS 4.x (up to 4.3.4) by encoding a private or reserved IPv4 address as an IPv6-mapped IPv4 address (e.g. ::ffff:127.0.0.1). The validateExternalImageHost() check relies on PHP filter_var() with FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE, which fails to detect private IPv4 addresses embedded in IPv6-mapped form. A crafted image URL such as http://[::ffff:127.0.0.1]:8080/x.jpg submitted through a user-controlled image field passes validation, and file_get_contents() connects to the mapped internal IPv4 address, enabling blind SSRF to localhost, private networks, and cloud metadata services (e.g. x.x.x.x). The publicly accessible /resize/{file} route requires no authentication. |
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| Fonte | ⚠️ https://github.com/0xGenesi/CVE/blob/main/October_CMS_SSRF_IPv6_Mapped_IPv4_Bypass.md |
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| Utilizador | chenhuanlin (UID 100424) |
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| Submissão | 11/08/2026 09h39 (há 2 meses) |
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| Moderação | 27/09/2026 12h41 (2 months later) |
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| Estado | Aceite |
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| Entrada VulDB | 410875 [October CMS até 4.3.4 SSRF Protection ResizeImages.php validateExternalImageHost Elevação de Privilégios] |
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| Pontos | 20 |
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