GHSA-f3gw-9ww9-jmc3 is a critical-severity (CVSS 10) Code Injection vulnerability in craftcms/cms. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-03-20) — treat it as actively exploited and patch now. A fix is available for craftcms/cms — see the affected versions and patch details below.
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-03-20. Federal agencies were required to remediate by 2026-04-03.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for GHSA-f3gw-9ww9-jmc3.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
GHSA-f3gw-9ww9-jmc3 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 395,249 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
craftcms/cms🐘craftcms/cms🐘craftcms/cmsReal-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
This is an additional fix for https://github.com/craftcms/cms/security/advisories/GHSA-4w8r-3xrw-v25g
This is a high-impact, low-complexity attack vector. To mitigate the issue, users running Craft installations before the fixed versions are encouraged to update to at least that version.
Details
https://craftcms.com/knowledge-base/craft-cms-cve-2025-32432
References
https://github.com/craftcms/cms/commit/e1c85441fa47eeb7c688c2053f25419bc0547b47
https://github.com/craftcms/cms/blob/3.x/CHANGELOG.md#3915---2025-04-10-critical https://github.com/craftcms/cms/blob/4.x/CHANGELOG.md#41415---2025-04-10-critical https://github.com/craftcms/cms/blob/5.x/CHANGELOG.md#5617---2025-04-10-critical
https://sensepost.com/blog/2025/investigating-an-in-the-wild-campaign-using-rce-in-craftcms/
Credits
Credit to Orange Cyberdefense for discovering a reporting this bug.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | craftcms/cms | ≥ 3.0.0-RC1&&< 3.9.15 | 3.9.15composer require craftcms/cms:^3.9.15 |
| 🐘Packagist | craftcms/cms | ≥ 4.0.0-RC1&&< 4.14.15 | 4.14.15composer require craftcms/cms:^4.14.15 |
| 🐘Packagist | craftcms/cms | ≥ 5.0.0-RC1&&< 5.6.17 | 5.6.17composer require craftcms/cms:^5.6.17 |
Affected Products
craft cmscraftcmsResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Craft CMS 5.6.16 - RCE
by banyamer · Apr 29, 2026
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for craftcms/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update craftcms/cms to 3.9.15 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-f3gw-9ww9-jmc3 is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
How to detect GHSA-f3gw-9ww9-jmc3
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id ghsa-f3gw-9ww9-jmc3 -u https://target- Template
- CraftCMS - Remote Code Execution
- Severity
- critical
- Impact
- Unauthenticated attackers can exploit remote code execution vulnerabilities through unsafe deserialization in the asset transform functionality, achieving complete server compromise.
- Remediation
- This issue has been patched in versions 3.9.15, 4.14.15, and 5.6.17, and is an additional fix for CVE-2023-41892.
Template by ProjectDiscovery nuclei-templates (iamnoooob, rootxharsh, pdresearch), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is GHSA-f3gw-9ww9-jmc3 in your dependencies?
Find it across Packagist, including transitive dependencies.