# CVE-2026-19860: JetFormBuilder 3.5.6.2 - 3.6.5.2 - Admin+ Arbitrary File Deletion via Server-Side Validation Callback

> Administrators can delete arbitrary server files via unsafe validation callbacks, requiring form submission to trigger.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Sep 2026
- **Updated:** 19 Sep 2026
- **Also known as:** GHSA-mqwg-84ff-gqhv

## What is CVE-2026-19860?

CVE-2026-19860 is a medium-severity vulnerability in Unknown JetFormBuilder — Dynamic Blocks Form Builder, published on 19 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The JetFormBuilder — Dynamic Blocks Form Builder WordPress plugin before 3.6.5.3 does not sufficiently restrict which PHP functions can be used as a custom field-validation callback, relying on a blocklist that omits a file-deletion function, allowing users able to manage forms to cause arbitrary files on the server to be deleted. The deletion itself is carried out when the form is submitted, which requires no authentication.

Weakness: CWE-73 (External Control of File Name or Path)

## Which versions are affected by CVE-2026-19860?


## How do I fix CVE-2026-19860?

No fix has been published for CVE-2026-19860 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-19860 being exploited?

There is no known exploitation of CVE-2026-19860 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19860 and fix it if it is affected.

What it is: CVE-2026-19860 is a medium-severity vulnerability in Unknown JetFormBuilder — Dynamic Blocks Form Builder, published on 19 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-19860 in the wild and no public exploit code.

Affected product: Unknown JetFormBuilder — Dynamic Blocks Form Builder. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-19860/ (Markdown: https://insights.sbomify.com/CVE-2026-19860/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19860
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19860
- OSV: https://osv.dev/vulnerability/CVE-2026-19860

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-19860/
Summaries are generated and may contain mistakes; the official description above is the record.