CVE-2026-54030

CRITICALNVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 98% 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
9.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.3Exploit: 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 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata (RFC 9728) matches the configured MCP server URL, allowing a malicious MCP server to steal access tokens intended for a legitimate server. This vulnerability is fixed in 0.8.5.

CVSS v3
9.3
EG Score
9.3(medium)
EPSS
1.7%
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

Missing Resource Parameter Validation in MCP OAuth Flow · Advisory · danny-avila/LibreChat · GitHub

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 50× in last 7d / 100× 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. 2026-07-12 08:45 UTCEG score recompute
  2. 2026-07-12 05:46 UTCEPSS rescore
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  1. 2026-07-08 15:16 UTCEPSS rescore
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  61. 2026-06-30 05:48 UTCEG score recompute▲ 1.30
  62. 2026-06-30 00:21 UTCNVD updateCVSS v3 → 9.3 · severity → CRITICAL
  63. 2026-06-29 16:50 UTCEG score recompute
  64. 2026-06-29 03:51 UTCEG score recompute
  65. 2026-06-28 14:48 UTCEG score recompute
  66. 2026-06-28 14:07 UTCEPSS rescore
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  72. 2026-06-26 23:55 UTCEG score recompute
  73. 2026-06-26 10:57 UTCEG score recompute
  74. 2026-06-25 17:51 UTCEG score recompute
  75. 2026-06-25 17:48 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-54030?
CVE-2026-54030 is a critical vulnerability published on June 25, 2026. LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata (RFC 9728) matches the configured MCP server URL, allowing a malicious MCP server to…
When was CVE-2026-54030 disclosed?
CVE-2026-54030 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-2026-54030 actively exploited?
CVE-2026-54030 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54030?
CVE-2026-54030 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-54030?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54030, 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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