Cross-Site Scripting in Rack Web Server Interface
CVE-2026-25500

5.4MEDIUM

Key Information:

Vendor

Rack

Status
Rack
Vendor
CVE Published:
18 February 2026

What is CVE-2026-25500?

The Rack web server interface prior to specified versions contains a vulnerability in the Rack::Directory component. This issue arises when file names on disk begin with the javascript: scheme, allowing the generation of an HTML directory index that includes clickable links. For example, a file with the basename javascript:alert(1) can be rendered, which executes JavaScript when clicked, potentially leading to harmful actions in the browser. The vulnerability was addressed in versions 2.2.22, 3.1.20, and 3.2.5.

Affected Version(s)

rack < 2.2.22 < 2.2.22

rack >= 3.0.0.beta1, < 3.1.20 < 3.0.0.beta1, 3.1.20

rack >= 3.2.0, < 3.2.5 < 3.2.0, 3.2.5

References

https://github.com/rack/rack/security/advisories/GHSA-whr...
x_refsource_CONFIRM
https://github.com/rack/rack/commit/f2f225f297b99fbee3d9f...
x_refsource_MISC

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.