---
id: CVE-2026-56207
title: 'Apache Impala: SAML authentication bypass via forged bearer token'
summary: >-
  Signature of Bearer token is not verified in last step of SAML2 authentication
  for Impala's hs2-http interface, allowing altering user name and acting as
  another user.




  This issue affects Apache Impala: >=4.0.0.




  Users are recommende…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: adp
cwe:
  - CWE-347
vendor: Apache Software Foundation
product: Apache Impala
affected:
  - apache_impala >= 4.0.0 <= 4.5.1
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-10T17:57:18.875085Z'
published: '2026-09-09'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T17:58:21.228Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-56207'
references:
  - url: 'https://lists.apache.org/thread/20cov78py0zqzx7dyq39ktythkwn91zs'
tags:
  - cve.org
epss: 0.00468
epssPercentile: 0.39709
ingestedAt: '2026-09-11T14:42:19.863Z'
---

## Overview

Signature of Bearer token is not verified in last step of SAML2 authentication for Impala's hs2-http interface, allowing altering user name and acting as another user.



This issue affects Apache Impala: >=4.0.0.



Users are recommended to upgrade to version 4.5.2, which fixes this issue.

## Affected

- `apache_impala >= 4.0.0 <= 4.5.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.