CVE-2026-26188
Freeform Craft Plugin CP UI (builder/integrations) has Stored Cross-Site Scripting (XSS) issue
Impact
**Summary** An authenticated, low-privilege user (able to create/edit forms) can inject arbitrary HTML/JS into the Craft Control Panel (CP) builder and integrations views. User-controlled form labels and integration metadata are rendered with `dangerouslySetInnerHTML` without sanitization, leading to stored XSS that executes when any admin views the builder/integration screens. **Affected Product** - Ecosystem: Packagist (Craft CMS plugin) - Package: solspace/craft-freeform - Version: <= 5.14.6 (latest observed). Likely all 5.x until patched. **Details** - Root cause: Multiple user-controlled strings (field labels, section labels, integration icons, short names, WYSIWYG previews) are injected into React components using `dangerouslySetInnerHTML` without sanitization. - Evidence: `dangerouslySetInnerHTML` on user-controlled properties in bundled CP JS at [packages/plugin/src/Resources/js/client/client.js](packages/plugin/src/Resources/js/client/client.js#L1). **PoCs** - Label-based XSS: 1. In Craft CP, create/edit a Freeform field and set its label to `<img src=x onerror="alert('xss-label')">`. 2. Open the form builder view containing the field. 3. Alert executes (stored XSS). - Integration icon SVG: 1. Set an integration "icon SVG" to `<svg><script>alert('xss-icon')</script></svg>`. 2. Open the integrations CP view. 3. Script executes. **Impact** Arbitrary JS in admin CP; session/CSRF token theft; potential full admin takeover via DOM-driven actions. **Remediation** - Sanitize/HTML-encode all user-controlled strings before passing to `dangerouslySetInnerHTML`, or avoid it for labels/titles/icons. - Server-side: strip/escape disallowed tags on save for fields, integration metadata, WYSIWYG content. - Add regression tests with `<img onerror>` payloads to ensure no execution in builder/integration views. **Workarounds** - Restrict form-edit permissions to trusted admins only until patched. - Consider CSP that disallows inline scripts (defense-in-depth only). **Credits** - Discovered by https://www.linkedin.com/in/praveenkavinda/ | Prav33N-Sec.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | solspace/craft-freeform | >= 5.0.0, <= 5.14.6 | 5.14.7 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Solspace | Freeform | from 5.0.0 before 5.14.7 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/solspace/craft-freeform/commit/b9adad6cdf1eba5400aae8b1ae39bd7d4d33af5e
- https://github.com/solspace/craft-freeform/releases/tag/v5.14.7
- https://github.com/solspace/craft-freeform/security/advisories/GHSA-jp3q-wwp3-pwv9
- https://github.com/advisories/GHSA-jp3q-wwp3-pwv9
- https://nvd.nist.gov/vuln/detail/CVE-2026-26188