Authorization bypass via omitted cache-key hints
Published Sep 14, 2026 · Updated Sep 14, 2026
Authorization bypass in AuthZed SpiceDB allows attackers to gain unconditional permission through dispatch cache poisoning. The checkRequestToKey and checkRequestToKeyWithCanonical functions omit CheckHints from dispatch cache keys, allowing one hint set to reuse a result computed for another. Exploitation requires intersecting or excluding relations, caveated and non-caveated paths, an enabled dispatch cache, and concurrent context-bearing lookups and checks for the same subject and resource.
Summary
What happened
Authorization bypass in AuthZed SpiceDB allows attackers to gain unconditional permission through dispatch cache poisoning. The checkRequestToKey and checkRequestToKeyWithCanonical functions omit CheckHints from dispatch cache keys, allowing one hint set to reuse a result computed for another. Exploitation requires intersecting or excluding relations, caveated and non-caveated paths, an enabled dispatch cache, and concurrent context-bearing lookups and checks for the same subject and resource.
The record
- CVE
- CVE-2026-55866
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Vendor
- AuthZed
- Product
- SpiceDB
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 14, 2026CVE publishedPublication date reported by the CVE source.
- Sep 14, 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=>= 1.34.1, < 1.54.0
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
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Public exploit references
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Technologies
Your stack
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Your stack
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