CVE-2026-73858 Solspace Freeform: Limited Twig template injection via submitted field values
Unauthenticated attackers can inject Twig expressions into form fields to disclose server and environment information via the isolated renderer.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-73858?
CVE-2026-73858 is a medium-severity code injection vulnerability in solspace craft-freeform, published on 23 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Solspace Freeform plugin for Craft CMS 5.x is a super flexible form-building tool. From 5.0.0 through 5.10.13, submitted values from public Freeform forms can be evaluated by the isolated Twig renderer when rendered into HTML attributes. An unauthenticated attacker can place Twig expressions in submitted field values, including value attributes, and receive evaluated PHP, operating-system, or Craft filesystem-path constants in the form response. The isolated context was not shown to expose Craft globals, environment variables, credentials, arbitrary files, or code execution, so the confirmed impact is limited server and environment information disclosure and possible rendering errors. This issue is fixed in version 5.10.14.
Weakness: CWE-1336
Which versions are affected by CVE-2026-73858?
2 open source packages ship an affected version, including solspace/craft-freeform.
| Package | Affected | Fixed in |
|---|---|---|
solspace/craft-freeform Packagist | From 5.0.0 | 5.10.14 |
solspace/craft-freeform Packagist | From 5.0.0 | 5.10.14 |
How do I fix CVE-2026-73858?
Upgrade solspace/craft-freeform to 5.10.14 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-73858 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73858 exists.
Sources
Also known as GHSA-gxrg-x694-283w.