CVE Details
CVE-2026-59822
BerriAI LiteLLM Improper Authentication Vulnerability
Published: 2026-09-02
CVSS: 8.8 HIGH
Product: BerriAI LiteLLM
Due Date: 2026-09-16
BerriAI LiteLLM contains an improper authentication vulnerability in the MCP Streamable HTTP endpoint that could allow an unauthenticated attacker to establish an authenticated MCP session using an arbitrary Bearer token.
GitHub PoC
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FIRST EPSS
EPSS estimates the probability of exploitation in the next 30 days. Higher values indicate higher likelihood of real-world exploitation.
Timeline
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References
Show Raw Data
| Key | Remaining Key | Value |
|---|---|---|
| dataType | CVE_RECORD | |
| dataVersion | 5.2 | |
| cveMetadata > | cveId | CVE-2026-59822 |
| cveMetadata > | assignerOrgId | a0819718-46f1-4df5-94e2-005712e83aaa |
| cveMetadata > | state | PUBLISHED |
| cveMetadata > | assignerShortName | GitHub_M |
| cveMetadata > | dateReserved | 2026-07-07T15:00:50.978Z |
| cveMetadata > | datePublished | 2026-07-08T19:32:18.611Z |
| cveMetadata > | dateUpdated | 2026-09-02T17:48:53.087Z |
| containers > | cna > title | LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallback |
| containers > | cna > problemTypes > 0 > descriptions > 0 > cweId | CWE-287 |
| containers > | cna > problemTypes > 0 > descriptions > 0 > lang | en |
| containers > | cna > problemTypes > 0 > descriptions > 0 > description | CWE-287: Improper Authentication |
| containers > | cna > problemTypes > 0 > descriptions > 0 > type | CWE |
| containers > | cna > problemTypes > 1 > descriptions > 0 > cweId | CWE-306 |
| containers > | cna > problemTypes > 1 > descriptions > 0 > lang | en |
| containers > | cna > problemTypes > 1 > descriptions > 0 > description | CWE-306: Missing Authentication for Critical Function |
| containers > | cna > problemTypes > 1 > descriptions > 0 > type | CWE |
| containers > | cna > metrics > 0 > cvssV4_0 > attackVector | NETWORK |
| containers > | cna > metrics > 0 > cvssV4_0 > attackComplexity | LOW |
| containers > | cna > metrics > 0 > cvssV4_0 > attackRequirements | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > privilegesRequired | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > userInteraction | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnConfidentialityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnIntegrityImpact | LOW |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnAvailabilityImpact | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > subConfidentialityImpact | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > subIntegrityImpact | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > subAvailabilityImpact | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > baseScore | 8.8 |
| containers > | cna > metrics > 0 > cvssV4_0 > baseSeverity | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > vectorString | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N |
| containers > | cna > metrics > 0 > cvssV4_0 > version | 4.0 |
| containers > | cna > references > 0 > name | https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q |
| containers > | cna > references > 0 > tags > 0 | x_refsource_CONFIRM |
| containers > | cna > references > 0 > url | https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q |
| containers > | cna > references > 1 > name | https://github.com/BerriAI/litellm/pull/26463 |
| containers > | cna > references > 1 > tags > 0 | x_refsource_MISC |
| containers > | cna > references > 1 > url | https://github.com/BerriAI/litellm/pull/26463 |
| containers > | cna > references > 2 > name | https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c |
| containers > | cna > references > 2 > tags > 0 | x_refsource_MISC |
| containers > | cna > references > 2 > url | https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c |
| containers > | cna > references > 3 > name | https://github.com/BerriAI/litellm/releases/tag/v1.84.0 |
| containers > | cna > references > 3 > tags > 0 | x_refsource_MISC |
| containers > | cna > references > 3 > url | https://github.com/BerriAI/litellm/releases/tag/v1.84.0 |
| containers > | cna > affected > 0 > vendor | BerriAI |
| containers > | cna > affected > 0 > product | litellm |
| containers > | cna > affected > 0 > versions > 0 > version | < 1.84.0 |
| containers > | cna > affected > 0 > versions > 0 > status | affected |
| containers > | cna > providerMetadata > orgId | a0819718-46f1-4df5-94e2-005712e83aaa |
| containers > | cna > providerMetadata > shortName | GitHub_M |
| containers > | cna > providerMetadata > dateUpdated | 2026-07-08T19:32:18.611Z |
| containers > | cna > descriptions > 0 > lang | en |
| containers > | cna > descriptions > 0 > value | LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key validation with an empty UserAPIKeyAuth() object, allowing requests to reach MCP tooling without a valid LiteLLM key. This issue is fixed in version 1.84.0. |
| containers > | cna > source > advisory | GHSA-7488-6r32-c95q |
| containers > | cna > source > discovery | UNKNOWN |
| containers > | adp > 0 > metrics > 0 > other > type | ssvc |
| containers > | adp > 0 > metrics > 0 > other > content > id | CVE-2026-59822 |
| containers > | adp > 0 > metrics > 0 > other > content > role | CISA Coordinator |
| containers > | adp > 0 > metrics > 0 > other > content > options > 0 > Exploitation | active |
| containers > | adp > 0 > metrics > 0 > other > content > options > 1 > Automatable | yes |
| containers > | adp > 0 > metrics > 0 > other > content > options > 2 > Technical Impact | partial |
| containers > | adp > 0 > metrics > 0 > other > content > version | 2.0.3 |
| containers > | adp > 0 > metrics > 0 > other > content > timestamp | 2026-09-02T17:44:06.058629Z |
| containers > | adp > 0 > references > 0 > url | https://www.wiz.io/blog/ai-infrastructure-honeypot |
| containers > | adp > 0 > references > 0 > tags > 0 | third-party-advisory |
| containers > | adp > 0 > references > 1 > url | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-59822 |
| containers > | adp > 0 > references > 1 > tags > 0 | government-resource |
| containers > | adp > 0 > title | CISA ADP Vulnrichment |
| containers > | adp > 0 > providerMetadata > orgId | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| containers > | adp > 0 > providerMetadata > shortName | CISA-ADP |
| containers > | adp > 0 > providerMetadata > dateUpdated | 2026-09-02T17:48:53.087Z |