CVE-2023-4136 — crafter-engine
MEDIUMCVE-2023-4136 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.craftercms:crafter-engine. A fix is available for org.craftercms:crafter-engine — see the affected versions and patch details below.
Cross-site Scripting (XSS) in CrafterCMS
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-4136.
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
CVE-2023-4136 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 377,166 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
org.craftercms:crafter-engine☕org.craftercms:crafter-engineReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in CrafterCMS Engine on Windows, MacOS, Linux, x86, ARM, 64 bit allows Reflected XSS.This issue affects CrafterCMS: from 4.0.0 through 4.0.2, from 3.1.0 through 3.1.27.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.craftercms:crafter-engine | ≥ 4.0.0&&< 4.0.3 | 4.0.3org.craftercms:crafter-engine:4.0.3 |
| ☕Maven | org.craftercms:crafter-engine | ≥ 3.1.0&&< 3.1.28 | 3.1.28org.craftercms:crafter-engine:3.1.28 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.craftercms:crafter-engine, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.craftercms:crafter-engine to 4.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-4136 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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2023-4136 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2023-4136. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
How to detect CVE-2023-4136
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2023-4136 -u https://target- Template
- CrafterCMS Engine - Cross-Site Scripting
- Severity
- medium
- Impact
- Unauthenticated attackers can inject malicious JavaScript through the transformerName parameter in various API endpoints to steal CrafterCMS user credentials and session data.
- Remediation
- Update CrafterCMS Engine to the latest version that addresses this vulnerability.
Template by ProjectDiscovery nuclei-templates (ritikchaddha), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2023-4136 in your dependencies?
O3 Security finds CVE-2023-4136 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.