CVE-2025-61928
In versions prior to 1.3.26, unauthenticated attackers can create or modify API keys for any user by passing that user's id in the request body to the `api/auth/api-key/create` route. `session?.user ??
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 18.8%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
Description
Better Auth is an authentication and authorization library for TypeScript. In versions prior to 1.3.26, unauthenticated attackers can create or modify API keys for any user by passing that user's id in the request body to the `api/auth/api-key/create` route. `session?.user ?? (authRequired ? null : { id: ctx.body.userId })`. When no session exists but `userId` is present in the request body, `authRequired` becomes false and the user object is set to the attacker-controlled ID. Server-only field validation only executes when `authRequired` is true (lines 280-295), allowing attackers to set privileged fields. No additional authentication occurs before the database operation, so the malicious payload is accepted. The same pattern exists in the update endpoint. This is a critical authentication bypass enabling full an unauthenticated attacker can generate an API key for any user and immediately gain complete authenticated access. This allows the attacker to perform any action as the victim user using the api key, potentially compromise the user data and the application depending on the victim's privileges. Version 1.3.26 contains a patch for the issue.
- CVSS 4.0
- 9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 18.84% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-285, CWE-306
- Source
- security-advisories@github.com
EPSS 18.8% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.