How severe is CVE-2025-66452?

CVE-2025-66452 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-66452 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66452?

CVE-2025-66452 affects Librechat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66452?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-66452 have an EU (EUVD) identifier?

Yes. CVE-2025-66452 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202928.

When was CVE-2025-66452 published?

CVE-2025-66452 was published on 2025-12-11 and last updated on 2026-06-17.

CVE-2025-66452

CVE-2025-66452 is a medium-severity vulnerability in Librechat with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-202928
Weakness: CWE-79
Affected product: Librechat
Published: 2025-12-11
Last modified: 2026-06-17

Description

LibreChat is a ChatGPT clone with additional features. In versions 0.8.0 and below, there is no handler for JSON parsing errors; SyntaxError from express.json() includes user input in the error message, which gets reflected in responses. User input (including HTML/JavaScript) can be exposed in error responses, creating an XSS risk if Content-Type isn't strictly enforced. This issue does not have a fix at the time of publication.

Frequently asked questions

What is CVE-2025-66452?: LibreChat is a ChatGPT clone with additional features. In versions 0.8.0 and below, there is no handler for JSON parsing errors; SyntaxError from express.json() includes user input in the error message, which gets reflected in responses. User input (including HTML/JavaScript) can be exposed in error responses, creating an XSS risk if Content-Type isn't strictly enforced. This issue does not have a fix at the time of publication.
How severe is CVE-2025-66452?: CVE-2025-66452 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-66452 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66452?: CVE-2025-66452 affects Librechat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66452?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66452 have an EU (EUVD) identifier?: Yes. CVE-2025-66452 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202928.
When was CVE-2025-66452 published?: CVE-2025-66452 was published on 2025-12-11 and last updated on 2026-06-17.

References

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-q6c5-gvj5-c264

Affected products (1)

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

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