Cross-tenant object disclosure via unscoped URI resolution
Published Sep 3, 2026 · Updated Sep 3, 2026
Authorization bypass in HumanSignal Label Studio 1.23.0 and earlier allows remote authenticated users to read other tenants' cloud objects. TaskResolveStorageUri and ProjectResolveStorageUri fetch tasks or projects by bare primary key, while URI validation matches only the storage scheme and bucket before presigning or streaming an attacker-supplied key. Exploitation requires an account in a separate organization and a victim project connected to S3, GCS, or Azure storage; the reported consequence is object disclosure.
Summary
What happened
Authorization bypass in HumanSignal Label Studio 1.23.0 and earlier allows remote authenticated users to read other tenants' cloud objects. TaskResolveStorageUri and ProjectResolveStorageUri fetch tasks or projects by bare primary key, while URI validation matches only the storage scheme and bucket before presigning or streaming an attacker-supplied key. Exploitation requires an account in a separate organization and a victim project connected to S3, GCS, or Azure storage; the reported consequence is object disclosure.
The record
- CVE
- CVE-2026-85211
- Published
- Sep 3, 2026
- Updated
- Sep 3, 2026
- Vendor
- HumanSignal
- Product
- Label Studio
- Classifications
- CWE-639, T1530
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 3, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 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.
- Affected versionversion=0 <=1.23.0
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- Cross-organization storage-URI proof of conceptproof of concept · demonstrated
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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