User Impersonation Affecting ash_authentication package, versions >=0.1.0 <4.14.0>=5.0.0-rc.0 <5.0.0-rc.10
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-HEX-ASHAUTHENTICATION-17818125
- published5 Jul 2026
- disclosed15 Jun 2026
- creditUnknown
Introduced: 15 Jun 2026
NewCVE-2026-49757 (opens in a new tab)How to fix?
Upgrade ash_authentication to version 4.14.0, 5.0.0-rc.10 or higher.
Overview
Affected versions of this package are vulnerable to User Impersonation via the user matching process. An attacker can gain unauthorized access to another user's account by registering an account with an OAuth provider using the victim's email address, even if the email is unverified or has been reused or reclaimed by the provider.