CVE-2026-32700
Description
A flaw was found in Devise, an authentication solution for Rails. A race condition in the Confirmable module allows a remote attacker to confirm an email address they do not own. By sending two concurrent email change requests, an attacker can desynchronize the confirmation token and unconfirmed email fields. This enables the attacker to confirm a victim's email on their own account, potentially leading to unauthorized account manipulation.
Statement
This MODERATE race condition vulnerability in Devise's Confirmable module allows authenticated attackers to confirm emails they don't own. Exploitation requires high complexity (precise timing of concurrent requests) and a valid account. The scope change to S:C is questionable as the attack stays within Devise's auth boundary. Impact is high to confidentiality and integrity through unauthorized email association. Affects applications using reconfirmable (default). Fixed in Devise 5.0.3.
Understanding the Weakness (CWE)
Integrity,Other
Technical Impact: Alter Execution Logic; Unexpected State
The attacker can gain access to otherwise unauthorized resources.
Integrity,Other
Technical Impact: Modify Application Data; Modify Files or Directories; Modify Memory; Other
Race conditions such as this kind may be employed to gain read or write access to resources which are not normally readable or writable by the user in question.
Integrity,Other
Technical Impact: Other
The resource in question, or other resources (through the corrupted one), may be changed in undesirable ways by a malicious user.
Non-Repudiation
Technical Impact: Hide Activities
If a file or other resource is written in this method, as opposed to in a valid way, logging of the activity may not occur.
Non-Repudiation,Other
Technical Impact: Other
In some cases it may be possible to delete files a malicious user might not otherwise have access to, such as log files.
Other
Technical Impact: Unexpected State
The product may perform invalid actions when the resource is in an unexpected state.
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