PT-2026-28104 · Danny Avila+1 · Librechat

Danny Avila + 1 · Published 2026-03-25 · Updated 2026-06-03 · CVE-2026-31942

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Name of the Vulnerable Software and Affected Versions LibreChat versions prior to 0.8.3-rc1

Description An Insecure Direct Object Reference (IDOR) exists in the 'PUT /api/keys' endpoint. Due to the use of the JavaScript object spread operator after setting the authenticated user's ID, an authenticated user can inject a userId parameter in the request body to overwrite the API keys of another user. This allows an attacker to replace a victim's API key configuration for providers such as OpenAI, Anthropic, or Azure, which could route conversations through attacker-controlled keys or cause a denial of service by providing invalid keys.

Recommendations Update to version 0.8.3-rc1.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-31942

Affected Products

Librechat

References · 5

• https://github.com/danny-avila/LibreChat/security/advisories/GHSA-5jcj-rh68-cgj7 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31942 · Security Note
• https://twitter.com/CVEnew/status/2061993204740657636 · Twitter Post
• https://t.me/CVEtracker/55669 · Telegram Post
• https://twitter.com/q1uf3ng/status/2036824777642655889 · Twitter Post