Quick answers
- Is CVE-2026-19862 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-19862 being exploited in the wild.
- How severe is CVE-2026-19862?
- Medium severity, with a CVSS score of 4.8, published 6 September 2026.
- Which products and versions are affected?
- Crocoblock JetFormBuilder before 3.6.5.2.
- Is there a fix for CVE-2026-19862?
- A patch was published on 2026-09-03: Fixed in version 3.6.5.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-19862 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-19862?
- Check whether you run Crocoblock JetFormBuilder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an email header injection flaw in the Send Email action component. The plugin accepts form field values and directly inserts them into email headers (CC, BCC, Reply-To) without validating or stripping carriage return and line feed (CRLF) characters. An unauthenticated attacker can submit a form with injected headers like "Bcc: attacker@evil.com" or "From: spoofed@domain.com" embedded in a form field, causing the email to be sent to unintended recipients or appear to come from a spoofed sender. Exploitation requires administrator configuration to source at least one message address (CC, BCC, or Reply-To) from a form field. The vulnerability was patched in version 3.6.5.2.
Affected products
- Crocoblock JetFormBuilder before 3.6.5.2
Timeline
- 2026-09-03: disclosed
- 2026-09-03: patched: Fixed in version 3.6.5.2