Description
LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT from the configured identity provider to authenticate as any existing user by exploiting an email-based fallback lookup in the JWT authentication flow without verifying the email_verified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxy_admin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.
Published: 2026-09-28
Score: 7.6 High
EPSS: n/a
KEV: No
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Remediation

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Tracking

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Advisories

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History

Mon, 28 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
Description LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT from the configured identity provider to authenticate as any existing user by exploiting an email-based fallback lookup in the JWT authentication flow without verifying the email_verified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxy_admin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.
Title LiteLLM Weak JWT Authentication via Email-Based User Lookup
Weaknesses CWE-1390
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 7.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-28T19:26:01.155Z

Reserved: 2026-09-17T18:41:40.758Z

Link: CVE-2026-93355

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-28T20:17:11.547

Modified: 2026-09-28T20:17:11.547

Link: CVE-2026-93355

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-28T20:30:06Z

Weaknesses