CVSS 3.1
5.4 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NCVE-2026-25500
Medium (5.4) in rack rack. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in rack 2.2.22, 3.1.20, 3.2.5.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-31)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- rack:rack
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-whrj-4476-wvmp | RubyGems | rack | <2.2.22 | 2.2.22 |
| GHSA-whrj-4476-wvmp | RubyGems | rack | >=3.0.0.beta1 <3.1.20 | 3.1.20 |
| GHSA-whrj-4476-wvmp | RubyGems | rack | >=3.2.0 <3.2.5 | 3.2.5 |