Authorization bypass via colliding condition cache keys
Published Mar 27, 2026 · Updated Mar 27, 2026
Improper policy enforcement in OpenFGA before 1.13.1 allows remote authenticated users to obtain incorrect authorization decisions. The pkg/storage cache-key serializer concatenates condition-context keys and values without encoding the key count or neutralizing control characters, so distinct requests can collide and reuse an earlier result. Exploitation requires relations that evaluate conditions with caching enabled; a poisoned allow or deny decision affects resources protected by the calling service.
Summary
What happened
Improper policy enforcement in OpenFGA before 1.13.1 allows remote authenticated users to obtain incorrect authorization decisions. The pkg/storage cache-key serializer concatenates condition-context keys and values without encoding the key count or neutralizing control characters, so distinct requests can collide and reuse an earlier result. Exploitation requires relations that evaluate conditions with caching enabled; a poisoned allow or deny decision affects resources protected by the calling service.
The record
- CVE
- CVE-2026-33729
- Published
- Mar 27, 2026
- Updated
- Mar 27, 2026
- Vendor
- OpenFGA
- Product
- OpenFGA
- Classifications
- CWE-1289, CWE-345, CWE-20, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 27, 2026CVE publishedPublication date reported by the CVE source.
- Mar 27, 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=< 1.13.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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