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CVE-2025-71400

better-auth passkey before 1.4.0 IDOR via delete-passkey

HIGH
7.1
CVSS Score
Published: August 2, 2026 at 12:15 PM UTC
Updated: October 8, 2026 at 04:16 PM UTC
2 products affected across 1 vendorBetter Auth /oauth ProviderBetter Auth Passkey

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Severity
HIGH7.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

better-auth passkey versions before 1.4.0 contain an insecure direct object reference vulnerability in the passkey deletion endpoint that allows authenticated users to delete arbitrary passkeys by ID. Attackers with valid sessions can submit crafted requests to the delete-passkey endpoint with enumerated passkey IDs to remove other users' passkeys.

Affected

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

Better Auth /oauth Provider· Better Auth
95%
v < 1.4.0
Affected range stops below 1.4.0, so it looks safe — our inference, not a vendor statement
Better Auth Passkey· Better Auth
90%
0 ≤ v < 1.4.00
Vendor states this is fixed in 1.4.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/better-auth/better-auth/security/advisories/GHSA-4vcf-q4xf-f48m
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/better-auth-passkey-before-idor-via-delete-passkey

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-639

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