What’s Vulnerable › Vulnerabilities

CVE-2026-108903: pH7Builder before 19.3.0 CAPTCHA Bypass via Client-Chosen Form ID

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-11 · updated 2026-10-13
• Weakness: CWE-807

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.

Affected products

• ph7software ph7builder: before 19.3.0 — fixed in 19.3.0

How to fix

Upgrade to a fixed version: ph7software ph7builder 19.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/pH7Software/pH7-Social-Dating-CMS
• 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/commit/4758d7d2ebfd5772faa25ef728c14f8f452e82f4
• https://www.vulncheck.com/advisories/ph7builder-before-19.3.0-captcha-bypass-via-client-chosen-form-id

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