CVE-2026-12796: BerriAI litellm SSO Login Does Not Invalidate Vulnerability

LOW
Advisory Identifier: GHSA-w2mh-qq9q-453x
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CVSS 6.3
CWE-613
Published
Advisory Summary

CVE-2026-12796 is a LOW (CVSS 6.3) sso login does not invalidate vulnerability (CWE-613: Insufficient Session Expiration) affecting BerriAI litellm libraries in the PyPI ecosystem. The issue involves sso login does not invalidate previous ui session tokens. Remediation is available in the latest vendor maintenance releases.

CVE-2026-12796 at a Glance

CVE Identifier CVE-2026-12796
GHSA Identifier GHSA-w2mh-qq9q-453x
Severity LOW
CVSS v3.1 Base Score 6.3
CWE Classification CWE-613: Insufficient Session Expiration
Affected Product BerriAI litellm
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2026-12796

To remediate this vulnerability, upgrade all affected BerriAI litellm dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

litellm fixed: Latest secure release 
pip install litellm>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show litellm

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-12796, inspect your installed packages using pip:

pip show litellm

Analyze the terminal output to locate any version of BerriAI litellm in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show litellm command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-613: Insufficient Session Expiration, where according to wasc, "insufficient session expiration is when a web site permits an attacker to reuse old session credentials or session ids for authorization.". In BerriAI litellm, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A vulnerability was identified in BerriAI litellm up to 1.82.2. This impacts the function get_redirect_response_from_openid of the file litellm/proxy/management_endpoints/ui_sso.py of the component SSO Authentication Flow. The manipulation leads to session expiration. The attack is possible to be carried out remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.

CVE-2026-12796 Affected BerriAI litellm Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
litellm
pypi/litellm
PyPI
≤ 1.82.2

References

NVD — CVE-2026-12796 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12796
BerriAI litellm Source Repository REPOSITORY
https://gist.github.com/YLChen-007/5fa8af12e1b183674d7ca96d852fb697
BerriAI litellm Source Repository REPOSITORY
https://github.com/BerriAI/litellm
vuldb.com/cve/cve-2026-12796 WEB
https://vuldb.com/cve/CVE-2026-12796
vuldb.com/submit/811287 WEB
https://vuldb.com/submit/811287
vuldb.com/vuln/372558 WEB
https://vuldb.com/vuln/372558
vuldb.com/vuln/372558/cti WEB
https://vuldb.com/vuln/372558/cti

Frequently Asked Questions

What is CVE-2026-12796?
CVE-2026-12796 is a security vulnerability in BerriAI litellm involving SSO Login Does Not Invalidate Previous UI Session Tokens under CWE-613: Insufficient Session Expiration.
Which BerriAI litellm versions are affected?
Affected versions include releases prior to current release patches across affected packages: litellm.
What version fixes CVE-2026-12796?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is litellm affected?
Yes, litellm is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-12796?
CVE-2026-12796 has a CVSS v3.1 base score of 6.3 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-12796?
CVE-2026-12796 is classified under CWE-613: Insufficient Session Expiration (According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization.").
How can I check PyPI dependencies for CVE-2026-12796?
Run the dependency tree command: 'pip show litellm'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-w2mh-qq9q-453x",
  "modified" : "2026-09-14T17:19:21Z",
  "published" : "2026-06-21T12:30:52Z",
  "aliases" : [ "CVE-2026-12796" ],
  "summary" : "BerriAI litellm: SSO Login Does Not Invalidate Previous UI Session Tokens",
  "details" : "A vulnerability was identified in BerriAI litellm up to 1.82.2. This impacts the function get_redirect_response_from_openid of the file litellm/proxy/management_endpoints/ui_sso.py of the component SSO Authentication Flow. The manipulation leads to session expiration. The attack is possible to be carried out remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "litellm"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.82.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-12796"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/YLChen-007/5fa8af12e1b183674d7ca96d852fb697"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/BerriAI/litellm"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-12796"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/811287"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/372558"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/372558/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-613" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-14T17:19:21Z",
    "nvd_published_at" : "2026-06-21T10:16:15Z"
  }
}