Description
Alluxio's S3 REST proxy fails to verify AWS Signature Version 4 signatures in its default configuration, allowing unauthenticated attackers to spoof user identity. Attackers can extract usernames from unsigned Authorization headers and impersonate any user, including service accounts, to read, write, and delete arbitrary data.
Published: 2026-08-25
Score: 9.3 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 25 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 25 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Description Alluxio's S3 REST proxy fails to verify AWS Signature Version 4 signatures in its default configuration, allowing unauthenticated attackers to spoof user identity. Attackers can extract usernames from unsigned Authorization headers and impersonate any user, including service accounts, to read, write, and delete arbitrary data.
Title Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature
First Time appeared Alluxio
Alluxio alluxio
Weaknesses CWE-287
CPEs cpe:2.3:a:alluxio:alluxio:*:*:*:*:*:*:*:*
Vendors & Products Alluxio
Alluxio alluxio
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-25T18:55:20.157Z

Reserved: 2026-08-25T14:32:37.763Z

Link: CVE-2026-79787

cve-icon Vulnrichment

Updated: 2026-08-25T18:54:36.703Z

cve-icon NVD

Status : Received

Published: 2026-08-25T19:16:54.907

Modified: 2026-08-25T19:16:54.907

Link: CVE-2026-79787

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses