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Vulnerabilities

Vulnerability · CVE-2026-31950

LibreChat is a ChatGPT clone with additional features.

Published Mar 27, 2026 · catalog updated Jun 17, 2026 · LibreChat is a ChatGPT

Check if you run it

No confirmed exploitation is on record for CVE-2026-31950. EPSS is 0.28%. Act only if a listed version of LibreChat is a ChatGPT is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (LibreChat is a ChatGPT).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.28%
Remediation
Advisory link
Affected products
cpe librechat/librechat

LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint does not verify that the requesting user owns the stream. Any authenticated user who obtains or guesses a valid stream ID can subscribe and read another user's real-time chat content, including messages, AI responses, and tool invocations. Version 0.8.2 patches the issue.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe librechat/librechat0.8.2

How to fix CVE-2026-31950

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-31950. EPSS is 0.28%. Act only if a listed version of LibreChat is a ChatGPT is installed.

Which versions are affected?

Compare what you have installed with 0.8.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-284: Improper Access Control; CWE-639: Authorization Bypass Through User-Controlled Key. EPSS 0.28%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 27, 2026 · NIST NVD

    Detected

    LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint does not verify that the requesting user owns the stream. Any authenticated user who obtains or guesses a valid stream ID can subscribe and read another user's real-time chat content, including messages, AI responses, and tool invocations. Version 0.8.2 patches the issue.

  2. Jun 17, 2026 · NIST NVD

    Updated

    LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint does not verify that the requesting user owns the stream. Any authenticated user who obtains or guesses a valid stream ID can subscribe and read another user's real-time chat content, including messages, AI responses, and tool invocations. Version 0.8.2 patches the issue.

Sources

  • CVE.orgVulnerability recordCVE-2026-31950

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-31950

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-31950

    LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint does not verify that the requesting user owns the stream. Any authenticated user who obtains or guesses a valid stream ID

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.