Vulnerability · Published Jun 21, 2026 · Assigned by VulDB

CVE-2026-12771BerriAI litellm M2M JWT user_api_key_auth.py improper authorization

Medium 5.0

In plain English

A medium-severity security flaw in litellm from BerriAI. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)5.0Medium

Exploit odds (30 days)0.4%top 62.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was identified in BerriAI litellm up to 1.82.2. This affects an unknown function of the file litellm/proxy/auth/user_api_key_auth.py of the component M2M JWT Handler. Such manipulation leads to improper authorization. The attack can be launched remotely. A high complexity level is associated with this attack. The exploitability is reported as difficult. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	litellm	no fix listed	GHSA-qmf3-4767-5fg3
PyPI	litellm	no fix listed	PYSEC-2026-4075

Affected products (as reported)

Vendor	Product	Versions
BerriAI	litellm	1.82.01.82.11.82.2

Weakness: CWE-285, CWE-266 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References

VDB-372513 | BerriAI litellm M2M JWT user_api_key_auth.py improper authorization vdb-entry
VDB-372513 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-12771 | CVE Analysis and Report third-party-advisory
Submit #811280 | litellm <= 1.82.2 Improper Authorization (CWE-285) third-party-advisory
https://gist.github.com/YLChen-007/70e4e106527f74ddf17953ff0f6c248d exploit