CVE-2026-108903: Reliance on Untrusted Inputs in a Security Decision in ph7software ph7builder
Description
pH7Builder versions before 19.3.0 contain a CAPTCHA bypass vulnerability that allows unauthenticated attackers to bypass form validation by supplying a client-chosen form ID. This enables attackers to submit forms without completing CAPTCHA verification, potentially automating abuse such as spam or unauthorized actions.
CVSS v4.0
Score 6.9medium
Affected software
ph7software
ph7builder
pkg:github/ph7software/pH7-Social-Dating-CMSRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-108903 describes a vulnerability in pH7Builder (pH7 Social Dating CMS) prior to version 19.3.0 where the PFBC Form::isValid() method relies on untrusted client input for form identification. Attackers can exploit this by loading a CAPTCHA-free form (e.g., login or search) and submitting its form ID with data intended for other forms (contact, comment, forum, invite, signup), effectively bypassing CAPTCHA validation and enabling automated abuse.
Potential Impact
The vulnerability allows unauthenticated attackers to bypass CAPTCHA protections on forms that normally require validation, increasing the risk of automated abuse such as spam submissions or unauthorized form actions. This can degrade service quality and potentially facilitate further attacks relying on automated form submissions.
Mitigation Recommendations
A fix is available in pH7Builder version 19.3.0. Users should upgrade to version 19.3.0 or later to remediate this vulnerability. No vendor advisory was provided, so check the official pH7Builder release notes or security advisories for patch availability and upgrade instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-11T14:47:10.598Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acba5592cdf04f656dd4a66
Added to database: 10/11/2026, 15:03:53 UTC
Last enriched: 10/11/2026, 15:18:24 UTC
Last updated: 10/11/2026, 15:19:04 UTC
Views: 4
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