CVE-2023-23927
MEDIUMCVE-2023-23927 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in craftcms/cms. 2 public exploit references exist, so weaponization risk is real. O3 Security confirms whether CVE-2023-23927 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Craft CMS stored cross-site scripting vulnerability
Blast Radius
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
Craft is a platform for creating digital experiences. When you insert a payload inside a label name or instruction of an entry type, an cross-site scripting (XSS) happens in the quick post widget on the admin dashboard. This issue has been fixed in version 4.3.7.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | craftcms/cms | ≥ 4.0.0-RC1&&< 4.3.7 | 4.3.7 |
| 🐘Packagist | craftcms/cms | ≥ 3.7.24&&< 3.7.64 | 3.7.64 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for craftcms/cms. 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 craftcms/cms to 4.3.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-23927 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 CVE-2023-23927 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 CVE-2023-23927. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-23927 in your dependencies?
O3 detects CVE-2023-23927 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.