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: < 1% Very Low
KEV: No
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 29 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 29 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-290
References
Metrics threat_severity

None

threat_severity

Important


Mon, 28 Sep 2026 23:30:00 +0000

Type Values Removed Values Added
First Time appeared Berriai
Berriai litellm
Vendors & Products Berriai
Berriai litellm

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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-29T14:10:00.894Z

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

Link: CVE-2026-93355

cve-icon Vulnrichment

Updated: 2026-09-29T14:09:51.891Z

cve-icon NVD

Status : Received

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

Modified: 2026-09-29T15:17:31.113

Link: CVE-2026-93355

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-28T19:26:01Z

Links: CVE-2026-93355 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-28T23:15:07Z

Weaknesses