CVE-2026-32700: Devise Devise Has A Confirmable "change Vulnerability

MODERATE
Advisory Identifier: GHSA-57hq-95w6-v4fc
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CVSS 5.3
CWE-362
Published
Advisory Summary

CVE-2026-32700 is a MODERATE (CVSS 5.3) devise has a confirmable "change vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Devise libraries in the RubyGems ecosystem. The issue involves devise has a confirmable "change email" race condition permits user to confirm email they have no access to. Remediation is available by upgrading affected packages to version 5.0.3.

CVE-2026-32700 at a Glance

CVE Identifier CVE-2026-32700
GHSA Identifier GHSA-57hq-95w6-v4fc
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Devise
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-32700

To remediate this vulnerability, upgrade all affected Devise dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

devise fixed: 5.0.3 
Upgrade devise to 5.0.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for devise

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-32700, inspect your project dependencies for Devise:

inspect dependencies for devise

Analyze the terminal output to locate any version of Devise in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.0.3), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. In Devise, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact A race condition in Devise's Confirmable module allows an attacker to confirm an email address they do not own. This affects any Devise application using the `reconfirmable` option (the default when using Confirmable with email changes). By sending two concurrent email change requests, an attacker can desynchronize the `confirmation_token` and `unconfirmed_email` fields. The confirmation token is sent to an email the attacker controls, but the `unconfirmed_email` in the database points to a victim's email address. When the attacker uses the token, the victim's email is confirmed on the attacker's account. ### Patches This is patched in Devise **v5.0.3**. Users should upgrade as soon as possible. ### Workarounds Applications can override this specific method from Devise models to force `unconfirmed_email` to be persisted when unchanged: (assuming your model is `User`) ```ruby class User < ApplicationRecord protected def postpone_email_change_until_confirmation_and_regenerate_confirmation_token unconfirmed_email_will_change! super end end ``` Note: Mongoid does not seem to respect that `will_change!` should force the attribute to be persisted, even if it did not really change, so you might have to implement a workaround similar to Devise by setting `changed_attributes["unconfirmed_email"] = nil` as well.

CVE-2026-32700 Affected Devise Versions

1 component(s)
Fixed Versions:
5.0.3
Product / Package Ecosystem Affected Versions Fixed Version
devise
gem/devise
RubyGems
< 5.0.3
5.0.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/heartcombo/devise/security/advisories/GHSA-57hq-95w6-v4fc
NVD — CVE-2026-32700 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-32700
Devise Source Repository REPOSITORY
https://github.com/heartcombo/devise/issues/5783
Devise Source Repository REPOSITORY
https://github.com/heartcombo/devise/pull/5784
Devise Source Repository REPOSITORY
https://github.com/heartcombo/devise
Devise Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/devise/CVE-2026-32700.yml
Devise Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/devise/GHSA-57hq-95w6-v4fc.yml

Frequently Asked Questions

What is CVE-2026-32700?
CVE-2026-32700 is a security vulnerability in Devise involving Devise has a confirmable "change email" race condition permits user to confirm email they have no access to under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Devise versions are affected?
Affected versions include releases prior to 5.0.3 across affected packages: devise.
What version fixes CVE-2026-32700?
Upgrading to 5.0.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is devise affected?
Yes, devise is affected in releases prior to 5.0.3. Upgrade your dependency to 5.0.3 or later.
What is the CVSS score of CVE-2026-32700?
CVE-2026-32700 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2026-32700?
CVE-2026-32700 is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check RubyGems dependencies for CVE-2026-32700?
Run the dependency tree command: 'inspect dependencies for devise'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-57hq-95w6-v4fc",
  "modified" : "2026-03-30T13:49:02Z",
  "published" : "2026-03-17T17:24:17Z",
  "aliases" : [ "CVE-2026-32700" ],
  "summary" : "Devise has a confirmable \"change email\" race condition permits user to confirm email they have no access to",
  "details" : "### Impact\n\nA race condition in Devise's Confirmable module allows an attacker to confirm an email address they do not own. This affects any Devise application using the `reconfirmable` option (the default when using Confirmable with email changes).\n\nBy sending two concurrent email change requests, an attacker can desynchronize the `confirmation_token` and `unconfirmed_email` fields. The confirmation token is sent to an email the attacker controls, but the `unconfirmed_email` in the database points to a victim's email address. When the attacker uses the token, the victim's email is confirmed on the attacker's account.\n\n### Patches\n\nThis is patched in Devise **v5.0.3**. Users should upgrade as soon as possible.\n\n### Workarounds\n\nApplications can override this specific method from Devise models to force `unconfirmed_email` to be persisted when unchanged: (assuming your model is `User`)\n\n```ruby\nclass User < ApplicationRecord\n  protected\n\n  def postpone_email_change_until_confirmation_and_regenerate_confirmation_token\n    unconfirmed_email_will_change!\n    super\n  end\nend\n```\n\nNote: Mongoid does not seem to respect that `will_change!` should force the attribute to be persisted, even if it did not really change, so you might have to implement a workaround similar to Devise by setting `changed_attributes[\"unconfirmed_email\"] = nil` as well.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "devise"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.0.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.0.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/heartcombo/devise/security/advisories/GHSA-57hq-95w6-v4fc"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-32700"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/heartcombo/devise/issues/5783"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/heartcombo/devise/pull/5784"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/heartcombo/devise"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/devise/CVE-2026-32700.yml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/devise/GHSA-57hq-95w6-v4fc.yml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-362" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-17T17:24:17Z",
    "nvd_published_at" : "2026-03-18T21:16:26Z"
  }
}