Quick answers
- Is CVE-2026-78838 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-78838 being exploited in the wild.
- How severe is CVE-2026-78838?
- Medium severity, with a CVSS score of 6.5, published 8 September 2026.
- Which products and versions are affected?
- AppNitro MachForm v30.
- Is there a fix for CVE-2026-78838?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-78838 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-78838?
- Check whether you run AppNitro MachForm 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
A reflected cross-site scripting (XSS) vulnerability exists in the grid_datasource.php component due to insufficient input validation on the filter[filters][0][field] parameter. The vulnerability is triggered when an unauthenticated attacker crafts a malicious URL containing JavaScript payload, which is reflected in the response without proper sanitization. The attack requires no authentication and relies on user interaction (victim clicking the link), and allows arbitrary JavaScript execution in the victim's browser context. The fix involves proper output encoding and input validation on the vulnerable parameter.
Affected products
- AppNitro MachForm v30
Timeline
- 2026-09-08: disclosed