CVE-2026-54040

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.1
EG Score
7.1(medium)
EPSS
4.6%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass · Advisory · danny-avila/LibreChat · GitHub

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-h59w-x9h4-m6gv

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 61× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-13 22:31 UTCEPSS rescore
  2. 2026-07-13 22:18 UTCEG score recompute
  3. 2026-07-13 10:14 UTCEG score recompute
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-13 06:13 UTCEPSS rescore
  6. 2026-07-12 22:09 UTCEG score recompute
  7. 2026-07-12 10:05 UTCEG score recompute
  8. 2026-07-12 05:46 UTCEPSS rescore
  9. 2026-07-11 22:00 UTCEG score recompute
  10. 2026-07-11 09:55 UTCEG score recompute
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-10 21:51 UTCEG score recompute
  14. 2026-07-10 09:47 UTCEG score recompute
  15. 2026-07-09 21:36 UTCEG score recompute
  16. 2026-07-09 19:10 UTCEPSS rescore
  17. 2026-07-09 19:10 UTCEPSS rescore
  18. 2026-07-09 09:33 UTCEG score recompute
  19. 2026-07-08 21:29 UTCEG score recompute
  20. 2026-07-08 15:16 UTCEPSS rescore
  21. 2026-07-08 15:16 UTCEPSS rescore
  22. 2026-07-08 09:24 UTCEG score recompute
  23. 2026-07-07 21:21 UTCEG score recompute
  24. 2026-07-07 13:46 UTCEPSS rescore
  25. 2026-07-07 13:46 UTCEPSS rescore
Show 36 more
  1. 2026-07-07 09:16 UTCEG score recompute
  2. 2026-07-06 21:12 UTCEG score recompute
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 09:06 UTCEG score recompute
  6. 2026-07-05 20:59 UTCEG score recompute
  7. 2026-07-05 08:54 UTCEG score recompute
  8. 2026-07-05 02:31 UTCEPSS rescore
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-04 20:50 UTCEG score recompute
  11. 2026-07-04 08:46 UTCEG score recompute
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-03 20:41 UTCEG score recompute
  15. 2026-07-03 08:36 UTCEG score recompute
  16. 2026-07-02 20:32 UTCEG score recompute
  17. 2026-07-02 08:28 UTCEG score recompute
  18. 2026-07-01 20:24 UTCEG score recompute
  19. 2026-07-01 15:07 UTCEPSS rescore
  20. 2026-07-01 08:20 UTCEG score recompute
  21. 2026-06-30 23:22 UTCEPSS rescore
  22. 2026-06-30 20:16 UTCEG score recompute
  23. 2026-06-30 08:12 UTCEG score recompute
  24. 2026-06-29 20:08 UTCEG score recompute▲ 1.20
  25. 2026-06-29 16:05 UTCNVD updateCVSS v3 → 7.1 · severity → HIGH
  26. 2026-06-29 14:06 UTCEPSS rescore
  27. 2026-06-29 14:06 UTCEPSS rescore
  28. 2026-06-28 19:34 UTCEG score recompute
  29. 2026-06-28 14:07 UTCEPSS rescore
  30. 2026-06-28 04:56 UTCEPSS rescore
  31. 2026-06-28 04:56 UTCEPSS rescore
  32. 2026-06-27 19:00 UTCEG score recompute
  33. 2026-06-27 03:08 UTCEPSS rescore
  34. 2026-06-26 18:25 UTCEG score recompute
  35. 2026-06-25 17:51 UTCEG score recompute
  36. 2026-06-25 17:48 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-54040?
CVE-2026-54040 is a high vulnerability published on June 25, 2026. 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…
When was CVE-2026-54040 disclosed?
CVE-2026-54040 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54040 actively exploited?
CVE-2026-54040 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54040?
CVE-2026-54040 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-54040?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54040, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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