[HIGH] CVE-2025-71400 — CVSS 7.1 (August 2, 2026)

A HIGH-severity vulnerability identified as CVE-2025-71400 has been published on August 2, 2026 with a CVSS base score of 7.1. This security advisory provides a detailed breakdown of the vulnerability, its potential impact, weakness classification, and actionable steps to protect your systems.

Vulnerability Details

CVE ID: CVE-2025-71400
Severity: HIGH
CVSS Score: 7.1
Published: August 2, 2026
Weakness (CWE): CWE-639

Technical 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.

Potential Impact

If exploited, this high-severity vulnerability could allow an attacker to tamper with system integrity. Organizations running affected software should treat this as a priority remediation item.

Recommended Action

No official patch is available yet. Until one is released:

1. Monitor the official NVD page and vendor channels for patch announcements.
2. Restrict access to the affected system or service where possible.
3. Apply network-level mitigations such as firewall rules or WAF policies.
4. Enable logging and alerting for anomalous activity related to this vulnerability.
5. Review your incident response plan in case of active exploitation.

View full details on NVD →

References

• Reference 1
• Reference 2

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