How severe is CVE-2026-54030?

CVE-2026-54030 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-54030 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54030?

CVE-2026-54030 primarily affects Librechat. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-54030?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-54030 have an EU (EUVD) identifier?

Yes. CVE-2026-54030 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39457.

When was CVE-2026-54030 published?

CVE-2026-54030 was published on 2026-06-25 and last updated on 2026-06-29.

CVE-2026-54030

CVE-2026-54030 is a high-severity vulnerability in Librechat with a CVSS 3.x base score of 8.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-346.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39457
Weakness: CWE-346
Affected product: Librechat
Published: 2026-06-25
Last modified: 2026-06-29

Description

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.

Frequently asked questions

What is CVE-2026-54030?: 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.
How severe is CVE-2026-54030?: CVE-2026-54030 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-54030 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54030?: CVE-2026-54030 primarily affects Librechat. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-54030?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-54030 have an EU (EUVD) identifier?: Yes. CVE-2026-54030 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39457.
When was CVE-2026-54030 published?: CVE-2026-54030 was published on 2026-06-25 and last updated on 2026-06-29.

References

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

Affected products (2)

cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*
cpe:2.3:a:librechat:librechat:0.8.5:rc1:*:*:*:*:*:*

More vulnerabilities in Librechat

CVE-2024-41704 — Critical (CVSS 9.8): LibreChat through 0.7.4-rc1 does not validate the normalized pathnames of images.
CVE-2024-41703 — Critical (CVSS 9.8): LibreChat through 0.7.4-rc1 has incorrect access control for message updates.
CVE-2026-32625 — Critical (CVSS 9.6): LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. In versions up to and including 0.8.3, the…
CVE-2026-22252 — Critical (CVSS 9.1): LibreChat is a ChatGPT clone with additional features. Prior to v0.8.2-rc2, LibreChat's MCP stdio transport accepts…
CVE-2025-69222 — Critical (CVSS 9.1): LibreChat is a ChatGPT clone with additional features. Version 0.8.1-rc2 is prone to a server-side request forgery…
CVE-2024-10361 — Critical (CVSS 9.1): An arbitrary file deletion vulnerability exists in danny-avila/librechat version v0.7.5-rc2, specifically within the…

All CVEs affecting Librechat →

Other CWE-346 vulnerabilities

CVE-2026-42901 — Critical (CVSS 10.0): Origin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-6508 — Critical (CVSS 9.8): Origin Validation Error vulnerability in TUBITAK BILGEM Software Technologies Research Institute Liderahenk allows…
CVE-2026-2790 — Critical (CVSS 9.8): Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR…
CVE-2022-50925 — Critical (CVSS 9.8): Prowise Reflect version 1.0.9 contains a remote keystroke injection vulnerability that allows attackers to send…
CVE-2025-30466 — Critical (CVSS 9.8): This issue was addressed through improved state management. This issue is fixed in Safari 18.4, iOS 18.4 and iPadOS…
CVE-2024-8487 — Critical (CVSS 9.8): A Cross-Origin Resource Sharing (CORS) vulnerability exists in modelscope/agentscope version v0.0.4. The CORS…

Browse all CWE-346 vulnerabilities →