CVE-2026-79787
Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-287 |
| Vendor | alluxio |
| Product | alluxio |
| Published | Aug 25, 2026 |
| Last Updated | Aug 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Alluxio / alluxio
0 ≤ 2.9.5
References
github.com: https://github.com/Alluxio/alluxio github.com: https://github.com/Alluxio/alluxio/issues/18755 github.com: https://github.com/Alluxio/alluxio/blob/v2.9.5/core/server/proxy/src/main/java/alluxio/proxy/s3/S3RestUtils.java vulncheck.com: https://www.vulncheck.com/advisories/alluxio-through-2.9.5-s3-rest-proxy-authentication-bypass-via-unverified-request-signature
Credits
George Chen