CVE-2026-73289Public exploitNetwork attack vector

Authorization bypass via transposed negated set quantifiers

Published Aug 12, 2026 · Updated Aug 12, 2026

Incorrect authorization in RustFS before 1.0.0-beta.12 allows remote authenticated users to bypass IAM and bucket-policy restrictions. The string-condition evaluator in crates/policy/src/policy/function/string.rs negates the aggregate result after quantification instead of negating each request-value predicate, transposing ForAllValues and ForAnyValue semantics. Affected policies must use a negated string operator with these set qualifiers; partially overlapping request and policy value sets can grant excluded principals access or suppress an intended Deny.

CVSS severity8.1
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in RustFS before 1.0.0-beta.12 allows remote authenticated users to bypass IAM and bucket-policy restrictions. The string-condition evaluator in crates/policy/src/policy/function/string.rs negates the aggregate result after quantification instead of negating each request-value predicate, transposing ForAllValues and ForAnyValue semantics. Affected policies must use a negated string operator with these set qualifiers; partially overlapping request and policy value sets can grant excluded principals access or suppress an intended Deny.

The record

CVE
CVE-2026-73289
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
RustFS
Product
RustFS
Classifications
CWE-863, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RustFS · RustFSversion=< 1.0.0-beta.12

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

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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