Vulnerability Description
Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, `Rack::Directory` generates an HTML directory index where each file entry is rendered as a clickable link. If a file exists on disk whose basename starts with the `javascript:` scheme (e.g. `javascript:alert(1)`), the generated index contains an anchor whose `href` is exactly `javascript:alert(1)`. Clicking the entry executes JavaScript in the browser (demonstrated with `alert(1)`). Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Rack | Rack | < 2.2.22 |
Related Weaknesses (CWE)
References
- https://github.com/rack/rack/commit/f2f225f297b99fbee3d9f51255d41f601fc40affPatch
- https://github.com/rack/rack/security/advisories/GHSA-whrj-4476-wvmpExploitMitigationVendor Advisory
FAQ
What is CVE-2026-25500?
CVE-2026-25500 is a vulnerability with a CVSS score of 5.4 (MEDIUM). Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, `Rack::Directory` generates an HTML directory index where each file entry is rendered as a clickable link. If ...
How severe is CVE-2026-25500?
CVE-2026-25500 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25500?
Check the references section above for vendor advisories and patch information. Affected products include: Rack Rack.