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TI-2026-55264 Aliases CVE-2026-79787GHSA-53ch-3jwm-f8ch

Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature

Priority HIGH 81CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00455 39th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Alluxioalluxioup to 2.9.5—No fix listedCNA
  • alluxio VendorAlluxio Affected up to 2.9.5 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-79787
  2. 2026-10-03 Alias added: GHSA-53ch-3jwm-f8ch

References

Other 3

  • TI-2023-20162 An issue in Alluxio v.2.9.3 and before allows an attacker to execute arbitrary code via a… CVSS 3.1CRITICAL 9.8
  • TI-2020-14063 Cross Site Scripting vulnerability in Alluxio v.1.8.1 allows a remote attacker to… CVSS 3.1MEDIUM 6.1
  • TI-2022-07851 In Alluxio before 2.7.3, the logserver does not validate the input stream. CVSS 3.1CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences