CVE-2026-54030

CRITICALNVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 94% 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
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 9.3Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

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
9.3CRITICALmedium confidence
EG Risk
46
EG Risk 46/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity93% × 45%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

Published

June 25, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Oct 8, 2026
🔬 Proof of concept available. Fix named in the CVE record. Sources: github.
githubMentions a patch (unverified)🟡 PoC Available

Missing Resource Parameter Validation in MCP OAuth Flow · Advisory · LibreChat-AI/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 7× in last 7d / 28× 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.

Showing the most recent 100 of 139 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:12 UTCEPSS rescore
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  1. 2026-09-13 16:47 UTCEPSS rescore
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  20. 2026-08-24 21:51 UTCEG score recompute
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  28. 2026-08-20 07:03 UTCEG score recompute
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  63. 2026-07-30 19:19 UTCEG score recompute
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  70. 2026-07-27 17:18 UTCEG score recompute
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  72. 2026-07-26 14:54 UTCEPSS rescore
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  74. 2026-07-24 14:18 UTCEPSS rescore
  75. 2026-07-23 14:18 UTCEPSS rescore

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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 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 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
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?
The CVE record for CVE-2026-54030 names the fix: "This vulnerability is fixed in 0.8.5."

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