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CVE-2026-12773

Litellm authentication bypass

7.3 HIGHPublic exploitEPSS 1.02%
  1. Published21 Jun 2026

Description

A weakness has been identified in BerriAI litellm up to 1.59.8. Affected is the function UserAPIKeyAuth of the file litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py of the component MCP Proxy. Executing a manipulation can lead to improper authentication. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

Litellm< 1.59.9

Remediation

Fixed in
Litellm≥ 1.59.9

References

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Frequently asked

Is CVE-2026-12773 being actively exploited?

CVE-2026-12773 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.02%.

How severe is CVE-2026-12773?

CVE-2026-12773 has a CVSS 3.1 base score of 7.3, rated high. EPSS estimates a 1.02% probability of exploitation.

Which products are affected by CVE-2026-12773?

Affected products include Litellm.

How do I fix CVE-2026-12773?

Upgrade affected software to a fixed version, for example Litellm 1.59.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-12773 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.