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TI-2021-06127 Aliases CVE-2021-23435GHSA-4hpq-rjcx-7vj9

Open redirect in clearance

Priority LOW 34CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-601.

Summary

This affects the package clearance before 2.5.0. The vulnerability can be possible when users are able to set the value of session[:return_to]. If the value used for return_to contains multiple leading slashes (/////example.com) the user ends up being redirected to the external domain that comes after the slashes (http://example.com).

Why it matters now

EPSS 0.00703 53rd percentileScored 2026-11-07
Fix Fixed clearance: 2.5.0clearance (RubyGems): 2.5.0

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—clearancebefore 2.5.02.5.0Patch availableCNA
—clearance (RubyGems)before 2.5.02.5.0Patch availableGHSA-4hpq-rjcx-7vj9
  • clearance Vendor— Affected before 2.5.0 Fixed in 2.5.0 Patch available CNA
  • clearance (RubyGems) Vendor— Affected before 2.5.0 Fixed in 2.5.0 Patch available GHSA-4hpq-rjcx-7vj9

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:thoughtbot:clearance:*:*:*:*:*:*:*:*before 2.5.0Vulnerablethoughtbot
  • cpe:2.3:a:thoughtbot:clearance:*:*:*:*:*:*:*:* Versions before 2.5.0 Vulnerable ·thoughtbot

Remediation

  • Fix · CNA clearance Fixed in 2.5.0
  • Fix · GHSA-4hpq-rjcx-7vj9 clearance (RubyGems) Fixed in 2.5.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-23435
  2. 2026-10-03 Alias added: GHSA-4hpq-rjcx-7vj9

References

Patch 1

Advisory 2

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences