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CVE-2026-121802

CRITICAL
9.1
CVSS Score
Published: November 4, 2026 at 02:36 AM UTC
Updated: November 4, 2026 at 03:17 AM UTC
1 product affected across 1 vendorAuth Better Auth

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Severity
CRITICAL9.1
Exploit prediction
EPSS 0.2%

Description

@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

Source: cverecord
https://github.com/better-auth/better-auth/security/advisories/GHSA-4wq4-2ppv-q3hg
Source: cverecord
https://github.com/better-auth/better-auth/blob/main/packages/expo/CHANGELOG.md
Source: cverecord
https://github.com/better-auth/better-auth/releases/tag/v1.7.16

CVSS

9.1CRITICALmitre
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-346

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