Privilege escalation via unchecked sibling key delegation
Published Sep 10, 2026 · Updated Sep 10, 2026
Authorization bypass in the Capgo backend through 12.242.4 allows remote authenticated users to exercise a sibling key's privileges. The middleware resolves an x-limited-key-id using its numeric ID, expiration state, and owning user, then replaces the active context without verifying parent-child delegation. An apikey_manager key can consequently assume a more privileged same-owner key's app_admin access without possessing that key's secret.
Summary
What happened
Authorization bypass in the Capgo backend through 12.242.4 allows remote authenticated users to exercise a sibling key's privileges. The middleware resolves an x-limited-key-id using its numeric ID, expiration state, and owning user, then replaces the active context without verifying parent-child delegation. An apikey_manager key can consequently assume a more privileged same-owner key's app_admin access without possessing that key's secret.
The record
- CVE
- CVE-2026-88862
- Published
- Sep 10, 2026
- Updated
- Sep 10, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-863, T1078
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 10, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
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Technologies
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Your stack
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