CVE-2022-37421 — cms
MEDIUMCVE-2022-37421 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in silverstripe/cms. A fix is available for silverstripe/cms — see the affected versions and patch details below.
Silverstipe CMS Stored XSS in custom meta tags
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-2022-37421.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
silverstripe/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
A malicious content author could create a custom meta tag and execute an arbitrary JavaScript payload. This would require convincing a legitimate user to access a page and enter a custom keyboard shortcut. This requires CMS access to exploit.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | silverstripe/cms | ≥ 4.0.0&&< 4.11.3 | 4.11.3composer require silverstripe/cms:^4.11.3 |
Affected Products
silverstripesilverstripeDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for silverstripe/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update silverstripe/cms to 4.11.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-37421 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
Is CVE-2022-37421 in your dependencies?
Find it across Packagist, including transitive dependencies.