CVE-2026-25500

MEDIUM EPSS 12.9%
Published Feb 18, 20264mo ago · Modified Jun 17, 20261w ago
5.4 CVSS 3.1
Medium
Find Similar
Published Feb 18, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
5.4
Exploitability
2.3
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
12.9% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 3

VendorProductVersionRange
rackrack* <2.2.22
rackrack*≥3.0.0  –  <3.1.20
rackrack*≥3.2.0  –  <3.2.5

References 2

  • github.com https://github.com/rack/rack/commit/f2f225f297b99fbee3d9f51255d41f601fc40aff
    Patch
  • github.com https://github.com/rack/rack/security/advisories/GHSA-whrj-4476-wvmp
    ExploitMitigationVendor Advisory

Remediation

  • github.com https://github.com/rack/rack/commit/f2f225f297b99fbee3d9f51255d41f601fc40aff
    Patch