Quick answers
- Is CVE-2026-19861 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-19861 being exploited in the wild.
- How severe is CVE-2026-19861?
- Medium severity, with a CVSS score of 4.7, published 5 September 2026.
- Which products and versions are affected?
- Crocoblock JetFormBuilder before 3.6.5.2.
- Is there a fix for CVE-2026-19861?
- A patch was published on 2026-09-05: Fix available 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-2026-19861 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-19861?
- 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 a stored HTML injection (CWE-79) in the email notification functionality. Unauthenticated users can submit form data containing HTML-entity-encoded payloads (e.g., "<img src=x onerror=alert()>") which bypass sanitization filters because decoding happens after filtering, not before. The injected HTML is then embedded in HTML-formatted notification emails sent via the "Send Email" post-action. An attacker needs only to identify a publicly accessible form with WYSIWYG or similar fields configured to send HTML emails. The payload is stored and rendered in emails to site administrators and other recipients; whether JavaScript executes depends on the mail client's HTML rendering behavior. The vulnerability is fixed in version 3.6.5.2.
Affected products
- Crocoblock JetFormBuilder before 3.6.5.2
Timeline
- 2026-09-03: disclosed
- 2026-09-05: advisory
- 2026-09-05: patched: Fix available in version 3.6.5.2