# CVE-2026-13439: Privilege escalation in Easy Form Builder by WhiteStudio – Drag & Drop Form Builder

> Unauthenticated attackers can escalate privileges to administrator by exploiting weak password recovery tokens in the Easy Form Builder WordPress plugin.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Jul 2026
- **Updated:** 21 Jul 2026
- **Also known as:** GHSA-3h5m-xwq3-mjmq

## What is CVE-2026-13439?

CVE-2026-13439 is a critical vulnerability in hassantafreshi Easy Form Builder by WhiteStudio – Drag & Drop Form Builder, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Easy Form Builder by WhiteStudio plugin for WordPress is vulnerable to Unauthenticated Privilege Escalation to Administrator in versions up to, and including, 4.0.11 This is due to the password recovery flow using the publicly-visible session identifier ('sid') as the password reset token stored in wp_emsfb_temp_links, combined with a publicly-accessible nonce refresh endpoint (Emsfb/v1/nonce/refresh) that issues valid WordPress REST nonces to unauthenticated visitors. This makes it possible for unauthenticated attackers to reset the password of any WordPress user — including administrators — by scraping the public sid from a published login form page, submitting a recovery request for any known user email via Emsfb/v1/forms/message/add, and then calling Emsfb/v1/forms/recovery/efb_set_password with the known sid to set an arbitrary new password and gain full administrator access.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2026-13439?


## How do I fix CVE-2026-13439?

No fix has been published for CVE-2026-13439 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13439 being exploited?

There is no known exploitation of CVE-2026-13439 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13439 and fix it if it is affected.

What it is: CVE-2026-13439 is a critical vulnerability in hassantafreshi Easy Form Builder by WhiteStudio – Drag & Drop Form Builder, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-13439 in the wild and no public exploit code.

Affected product: hassantafreshi Easy Form Builder by WhiteStudio – Drag & Drop 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-2026-13439/ (Markdown: https://insights.sbomify.com/CVE-2026-13439/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13439
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13439
- OSV: https://osv.dev/vulnerability/CVE-2026-13439

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-13439/
Summaries are generated and may contain mistakes; the official description above is the record.