pH7Builder before 19.3.0 CAPTCHA Bypass via Client-Chosen Form ID

Advisories

pH7Builder before 19.3.0 CAPTCHA Bypass via Client-Chosen Form ID

severity: medium
date: 10/11/2026
Affecting: ph7builder >= 0, < 19.3.0
CVE: CVE-2026-108903
CWE: CWE-807 Reliance on Untrusted Inputs in a Security Decision
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
References: Patch Commit
https://github.com/pH7Software/pH7-Social-Dating-CMS/blob/v19.2.0/_protected/app/system/modules/contact/forms/ContactForm.php#L33-L38
https://github.com/pH7Software/pH7-Social-Dating-CMS
Credit: Haluk Baran AKBULUT (CyberMap Group)
Description: pH7Builder (pH7 Social Dating CMS) before 19.3.0 contains a CAPTCHA bypass vulnerability that allows unauthenticated attackers to skip form validation by supplying a client-chosen form ID to PFBC Form::isValid(). Attackers can load a CAPTCHA-free form like login or search, then submit its ID with contact, comment, forum, invite or signup data to automate abuse.

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