# 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.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Sep 2026
- **Updated:** 23 Sep 2026
- **Also known as:** GHSA-gxrg-x694-283w

## 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 (Improper Neutralization of Special Elements Used in a Template Engine)

## Which versions are affected by CVE-2026-73858?

2 open source packages ship an affected version, including solspace/craft-freeform.


| Package | Ecosystem | 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.

## Is CVE-2026-73858 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73858 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73858 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73858 exists.

Affected packages and fixed versions:
- solspace/craft-freeform (Packagist): affected from 5.0.0; fixed in 5.10.14
- solspace/craft-freeform (Packagist): affected from 5.0.0; fixed in 5.10.14

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-73858/ (Markdown: https://insights.sbomify.com/CVE-2026-73858/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73858
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73858
- OSV: https://osv.dev/vulnerability/CVE-2026-73858

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73858/
Summaries are generated and may contain mistakes; the official description above is the record.