CVE-2026-79787 – Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature

​CVE ID :CVE-2026-79787

Published : Aug. 25, 2026, 6:23 p.m. | 24 minutes ago

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.

Severity: 9.8 | CRITICAL

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