How severe is CVE-2026-54033?

CVE-2026-54033 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-54033 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54033?

CVE-2026-54033 affects Librechat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-54033?

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-2026-54033 have an EU (EUVD) identifier?

Yes. CVE-2026-54033 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39460.

When was CVE-2026-54033 published?

CVE-2026-54033 was published on 2026-06-25 and last updated on 2026-06-29.

CVE-2026-54033

CVE-2026-54033 is a high-severity vulnerability in Librechat with a CVSS 3.x base score of 7.7. 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-918.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39460
Weakness: CWE-918
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 0.8.4-rc1, LibreChat allows users to configure custom OpenAI-compatible API endpoints by setting a baseURL. This URL is used to construct HTTP requests without any SSRF validation — no private IP check, no scheme restriction, no DNS pinning. An authenticated user can set baseURL to internal network addresses. This vulnerability is fixed in 0.8.4-rc1.

Frequently asked questions

What is CVE-2026-54033?: LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, LibreChat allows users to configure custom OpenAI-compatible API endpoints by setting a baseURL. This URL is used to construct HTTP requests without any SSRF validation — no private IP check, no scheme restriction, no DNS pinning. An authenticated user can set baseURL to internal network addresses. This vulnerability is fixed in 0.8.4-rc1.
How severe is CVE-2026-54033?: CVE-2026-54033 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-54033 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54033?: CVE-2026-54033 affects Librechat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-54033?: 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-2026-54033 have an EU (EUVD) identifier?: Yes. CVE-2026-54033 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39460.
When was CVE-2026-54033 published?: CVE-2026-54033 was published on 2026-06-25 and last updated on 2026-06-29.

References

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gc9r-88c3-7qhq

Affected products (1)

cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*

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