GHSA-x7m9-mwc2-g6w2 is a critical-severity (CVSS 9.8) Code Injection vulnerability in verbb/formie. O3 Security confirms whether GHSA-x7m9-mwc2-g6w2 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Formie: Pre-authenticated server-side template injection in Hidden fields
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-x7m9-mwc2-g6w2 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 0 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
verbb/formie🐘verbb/formieReal-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
Impact
- Unauthenticated users could submit crafted values into Hidden fields (with Default value → Custom) that were evaluated as Twig during submission handling, which could lead to serious compromise of the Craft site (depending on template/sandbox behavior).
- Sites with public Formie forms that include at least one Hidden field with that configuration.
- No CP login for the reported chain.
Patches
Workarounds
- Temporarily remove Hidden fields from public forms or switch Hidden default away from Custom where feasible
- Otherwise, upgrade to patched versions
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | verbb/formie | ≥ 3.0.0-beta.1&&< 3.1.24 | 3.1.24 |
| 🐘Packagist | verbb/formie | all versions | 2.2.20 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for verbb/formie. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update verbb/formie to 3.1.24 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-x7m9-mwc2-g6w2 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-x7m9-mwc2-g6w2 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-x7m9-mwc2-g6w2. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-x7m9-mwc2-g6w2 in your dependencies?
O3 detects GHSA-x7m9-mwc2-g6w2 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.