CVE-2026-46685Public exploitNetwork attack vector

Credentialed cross-origin data access via reflected Origin

Published May 28, 2026 · Updated May 28, 2026

CORS misconfiguration in RustFS before 1.0.0-beta.2 allows remote attackers to read credentialed S3 responses through a victim's browser. ConditionalCorsLayer reflects an arbitrary Origin and emits Access-Control-Allow-Credentials when RUSTFS_CORS_ALLOWED_ORIGINS is unset. Exploitation requires browser reachability to the listener, a visit to attacker-controlled content, and ambient credentials for the RustFS origin.

CVSS severity6.0
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CORS misconfiguration in RustFS before 1.0.0-beta.2 allows remote attackers to read credentialed S3 responses through a victim's browser. ConditionalCorsLayer reflects an arbitrary Origin and emits Access-Control-Allow-Credentials when RUSTFS_CORS_ALLOWED_ORIGINS is unset. Exploitation requires browser reachability to the listener, a visit to attacker-controlled content, and ambient credentials for the RustFS origin.

The record

CVE
CVE-2026-46685
Published
May 28, 2026
Updated
May 28, 2026
Vendor
RustFS
Product
RustFS
Classifications
CWE-306, CWE-942, CWE-346, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.0-beta.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RustFS · RustFSversion=< 1.0.0-beta.2

Published CVSS scores

6.0GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-942Permissive Cross-domain Policy with Untrusted Domains
CWE-346Origin Validation Error
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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