PT-2026-28431 · Librechat · Librechat

Logicx24 · Published 2026-03-27 · Updated 2026-03-28 · CVE-2026-31950

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions LibreChat versions 0.8.2-rc2 through 0.8.2-rc3

Description LibreChat, a ChatGPT clone, has an issue where the SSE streaming endpoint /api/agents/chat/stream/:streamId does not confirm that the user making the request is authorized to access the stream. This allows any authenticated user who has a valid stream ID—whether obtained legitimately or through guessing—to view another user’s real-time chat content, including messages, AI responses, and tool invocations. The streamId variable is a key component in this issue.

Recommendations Versions prior to 0.8.2 should be updated to version 0.8.2 or later.

Exploit

Fix

Improper Access Control

IDOR

Weakness Enumeration

CWE-284

CWE-639

Related Identifiers

CVE-2026-31950

GHSA-F6RF-VM44-WH5G

Affected Products

Librechat

References · 5

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31950.json · Exploit
• https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f6rf-vm44-wh5g · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-31950 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31950 · Security Note
• https://twitter.com/CVEnew/status/2037719421784060343 · Twitter Post