How severe is CVE-2026-31942?

CVE-2026-31942 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability low.

Is CVE-2026-31942 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-2026-31942?

CVE-2026-31942 affects Librechat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31942?

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-2026-31942 have an EU (EUVD) identifier?

Yes. CVE-2026-31942 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34044.

When was CVE-2026-31942 published?

CVE-2026-31942 was published on 2026-06-02 and last updated on 2026-06-17.

CVE-2026-31942

CVE-2026-31942 is a high-severity vulnerability in Librechat with a CVSS 3.x base score of 7.1. 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-862.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34044
Weakness: CWE-862
Affected product: Librechat
Published: 2026-06-02
Last modified: 2026-06-17

Description

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. In versions up to and including 0.7.6, an Insecure Direct Object Reference (IDOR) vulnerability exists in the API keys management endpoint (PUT /api/keys). Due to the use of the JavaScript object spread operator after setting the authenticated user's ID, any authenticated user can inject a userId parameter in the request body to overwrite any other user's API keys (e.g., OpenAI, Anthropic, Azure). This allows an attacker to replace a victim's API key configuration, potentially routing the victim's conversations through attacker-controlled keys or denying service by providing invalid keys. This is patched in version 0.8.3-rc1.

Frequently asked questions

What is CVE-2026-31942?: LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. In versions up to and including 0.7.6, an Insecure Direct Object Reference (IDOR) vulnerability exists in the API keys management endpoint (PUT /api/keys). Due to the use of the JavaScript object spread operator after setting the authenticated user's ID, any authenticated user can inject a userId parameter in the request body to overwrite any other user's API keys (e.g., OpenAI, Anthropic, Azure). This allows an attacker to replace a victim's API key configuration, potentially routing the victim's conversations through attacker-controlled keys or denying service by providing invalid keys. This is patched in version 0.8.3-rc1.
How severe is CVE-2026-31942?: CVE-2026-31942 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability low.
Is CVE-2026-31942 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-2026-31942?: CVE-2026-31942 affects Librechat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31942?: 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-2026-31942 have an EU (EUVD) identifier?: Yes. CVE-2026-31942 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34044.
When was CVE-2026-31942 published?: CVE-2026-31942 was published on 2026-06-02 and last updated on 2026-06-17.

References

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-5jcj-rh68-cgj7

Affected products (1)

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

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