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Medium · 6.4 CVE-2026-56306 EUVD-2026-38369

Capgo - Subkey Enforcement Bypass via x-limited-key-id Header Parsing

Published Jun 22, 2026 · Updated Jun 23, 2026 · Assigned by VulnCheck

Description

Capgo before 12.128.2 contains a weak parsing vulnerability in the x-limited-key-id header that allows attackers to bypass subkey enforcement by submitting malformed values, zero, or duplicate headers that result in NaN or falsy values. Remote attackers can manipulate the x-limited-key-id header to disable limited key scoping and execute requests using the main API key context instead of restricted subkey permissions.

Affected products

VendorProductAffectedFixed
Capgo Capgo < 12.128.2 12.128.2

References