Quick answers
- Is CVE-2026-5096 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-5096 being exploited in the wild.
- How severe is CVE-2026-5096?
- Medium severity, with a CVSS score of 5.3, published 28 August 2026.
- Which products and versions are affected?
- Klaus Greff Everest Forms up to and including 3.4.4.
- Is there a fix for CVE-2026-5096?
- 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-2026-5096 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-5096?
- Check whether anything you run is named in the advisory. 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 Server-Side Request Forgery (SSRF) flaw in the `load_previous_field_value()` method of `class-evf-form-task.php`. The method accepts arbitrary URL values from POST data for upload fields without domain validation, which are then passed to `wp_remote_head()` in the `get_local_file_size()` method of `class-evf-form-fields-upload.php`. An unauthenticated attacker can exploit this by submitting a form with an upload field containing a malicious URL while leaving a required field empty to trigger form re-rendering. This forces the WordPress server to make outbound HTTP HEAD requests to arbitrary URLs, potentially exposing internal network information or enabling interaction with internal services.
Affected products
- Klaus Greff Everest Forms up to and including 3.4.4
Timeline
- 2026-08-28: disclosed