# CVE-2026-19862: JetFormBuilder < 3.6.5.2 - Unauthenticated Email Header Injection via Send Email Action

> Unauthenticated attackers can inject email headers in JetFormBuilder if configured to use form fields for addresses, enabling sender spoofing and hidden recipients.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Sep 2026
- **Updated:** 6 Sep 2026
- **Also known as:** GHSA-9qrj-jm5v-82p9

## What is CVE-2026-19862?

CVE-2026-19862 is a medium-severity vulnerability in Unknown JetFormBuilder, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The JetFormBuilder WordPress plugin before 3.6.5.2 does not validate or strip line breaks from address values it sources from submitted form fields before adding them to the headers of the e-mails it sends, allowing unauthenticated users to inject arbitrary e-mail headers, add hidden recipients and spoof the sender. Exploitation requires the site to be configured to take one of the message's addresses from a form field.

Weakness: CWE-93 (Improper Neutralization of CRLF Sequences)

## Which versions are affected by CVE-2026-19862?


## How do I fix CVE-2026-19862?

No fix has been published for CVE-2026-19862 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-19862 being exploited?

There is no known exploitation of CVE-2026-19862 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19862 and fix it if it is affected.

What it is: CVE-2026-19862 is a medium-severity vulnerability in Unknown JetFormBuilder, published on 6 Sep 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-2026-19862 in the wild and no public exploit code.

Affected product: Unknown JetFormBuilder. 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-2026-19862/ (Markdown: https://insights.sbomify.com/CVE-2026-19862/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19862
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19862
- OSV: https://osv.dev/vulnerability/CVE-2026-19862

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-19862/
Summaries are generated and may contain mistakes; the official description above is the record.