CVE-2026-54040

Name: CVE-2026-54040
Creator: NVD / NIST
Published: 2026-06-25T17:16:41.123+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.15%

Last modified Jun 25, 2026

CVE-2026-54040 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/auth/2fa/backup/regenerate endpoint regenerates all 2FA backup codes without requiring any TOTP token or existing backup code verification. EPSS estimates a 0.15% chance of exploitation in the next 30 days.

Description

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/auth/2fa/backup/regenerate endpoint regenerates all 2FA backup codes without requiring any TOTP token or existing backup code verification. An attacker with a stolen session token can silently replace a victim's backup codes and use them to bypass 2FA login or disable 2FA entirely. This vulnerability is fixed in 0.8.4-rc1.

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

EPSS Probability

0.15%

4.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

References

Timeline

Published: Jun 25, 2026
Last Modified: Jun 25, 2026
Status: Undergoing Analysis

Frequently Asked Questions

What is CVE-2026-54040?

How severe is CVE-2026-54040?

CVE-2026-54040 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.15% probability of exploitation in the next 30 days.

How do I fix CVE-2026-54040?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-54040?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST