CVE-2026-56306mediumCWE-20

CVE-2026-56306: medium-severity vulnerability in Capgo

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

Published · Updated

Follow this CVE+ Monitor Capgo

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.3epss 0.3%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Affected products
Capgo · Capgo
Related CVEs — Capgo

In the same product, most dangerous first.

CVE-2026-56299MEDIUMCapgo - Denial of Service via Unauthenticated OPTIONS Request to /build/upload EndpointEPSS 0.7%CVE-2026-56323HIGHCapgo - Unauthenticated Channel Enumeration and App Oracle via GET /channel_selfEPSS 0.6%CVE-2026-56233HIGHCapgo - SSRF and Privilege Escalation via Path Traversal in Builder Upload ProxyEPSS 0.6%CVE-2026-56286HIGHCapgo - Account Deletion Without Password ConfirmationEPSS 0.5%CVE-2026-56222HIGHCapgo - Cross-Organization App Takeover via Mismatched org_id and app_id in /private/role_bindingsEPSS 0.5%CVE-2026-56237CRITICALCapgo - Unauthenticated API Key Generation via Client-Side Parameter ManipulationEPSS 0.5%