PT-2026-51197 · Berriai · Litellm

Eric-C · Published 2026-06-21 · Updated 2026-06-21 · CVE-2026-12773

Positive Technologies (AI Summary)

CVSS v2.0

7.5

High

Base vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Name of the Vulnerable Software and Affected Versions BerriAI litellm versions prior to 1.59.9

Description An improper authentication issue exists in the MCP Proxy component. A remote attacker can manipulate the UserAPIKeyAuth() function within the file litellm/proxy/ experimental/mcp server/auth/user api key auth mcp.py to bypass authentication mechanisms.

Recommendations Update to a version later than 1.59.8. As a temporary workaround, restrict access to the UserAPIKeyAuth() function in the MCP Proxy component to minimize the risk of exploitation.

Exploit

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2026-12773

Affected Products

Litellm

References · 9

• 🔥 https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-12773 · Security Note
• https://vuldb.com/submit/811282 · Note
• https://twitter.com/CVEnew/status/2068564456880087480 · Twitter Post
• https://vuldb.com/vuln/372515/cti · Note
• https://vuldb.com/vuln/372515 · Note
• https://twitter.com/VulmonFeeds/status/2068557178198261795 · Twitter Post
• https://twitter.com/infoflowcloud/status/2068565956406685812 · Twitter Post
• https://vuldb.com/cve/CVE-2026-12773 · Note