Auth bypass in Berriai Litellm
CVE-2026-12771
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (34.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Berriai Litellm — versions 1.82.0, 1.82.1, 1.82.2
- Litellm
Weakness classification (CWE)
References
- vuldb.com/vuln/372513 (VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/vuln/372513/cti (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/cve/CVE-2026-12771 (VDB Entry, Third Party Advisory, third-party-advisory)
- vuldb.com/submit/811280 (Exploit, VDB Entry, Third Party Advisory, third-party-advisory)
- gist.github.com/YLChen-007/70e4e106527f74ddf17953ff0f6c248d (Exploit, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2026-12771?
- CVE-2026-12771 is a medium-severity vulnerability in Berriai Litellm, classified under Incorrect Privilege Assignment. CVSS score: 5.0/10. Published 2026-06-21.
- How severe is CVE-2026-12771?
- Medium severity. CVSS v3 base score is 5.0 out of 10.