VULNERABILITY INTELLIGENCE

CVE-2021-41263

CVSS score8.3 HIGH
EPSS probability0.63%
CISA KEVNot currently listed
Published2021-11-15
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

Description

rails_multisite provides multi-db support for Rails applications. In affected versions this vulnerability impacts any Rails applications using `rails_multisite` alongside Rails' signed/encrypted cookies. Depending on how the application makes use of these cookies, it may be possible for an attacker to re-use cookies on different 'sites' within a multi-site Rails application. The issue has been patched in v4 of the `rails_multisite` gem. Note that this upgrade will invalidate all previous signed/encrypted cookies. The impact of this invalidation will vary based on the application architecture.

Weakness classification

  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-327: Use of a Broken or Risky Cryptographic Algorithm
  • CWE-565: Reliance on Cookies without Validation and Integrity Checking

Primary references