How severe is CVE-2026-26188?

No CVSS score has been assigned to CVE-2026-26188 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-26188?

CVE-2026-26188 affects the following packages: solspace/craft-freeform (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2026-26188?

Update solspace/craft-freeform to 5.14.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-26188 is resolved across your whole dependency graph.

How do I detect CVE-2026-26188 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for solspace/craft-freeform, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-26188 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2026-26188 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-26188 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-26188?

CVE-2026-26188 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 23th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-26188?

CVE-2026-26188 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-26188 published, and has it been updated?

CVE-2026-26188 was published on February 12, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

Not in CISA KEV

CVE-2026-26188 — craft-freeform

Fix: solspace/craft-freeform@b9adad6

CVE-2026-26188 is a Cross-site Scripting (XSS) vulnerability in solspace/craft-freeform. A fix is available for solspace/craft-freeform — see the affected versions and patch details below.

Solspace Freeform plugin affected by Stored Cross-Site Scripting (XSS) in Freeform Craft Plugin CP UI (builder/integrations)

Also known asGHSA-jp3q-wwp3-pwv9

Published

Feb 12, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-26188.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs23th percentile — riskier than 23% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐘solspace/craft-freeform

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

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

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`solspace/craft-freeform`	≥ 5.0.0&&< 5.14.7	5.14.7`composer require solspace/craft-freeform:^5.14.7`

Affected Products

1 product · 1 configurations

Application

freeformsolspace

≥ 5.0.0 && < 5.14.7

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for solspace/craft-freeform, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update solspace/craft-freeform to 5.14.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-26188 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

**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-controlle

O3 Security · Impact-Aware SCA

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