CVE-2026-100628: capgo.app before 12.128.12 Authentication Bypass via apikey

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-26 · updated 2026-09-28
Weakness: CWE-863

Description

capgo.app before 12.128.12 fails to enforce an organization's API key expiration policy when creating app-scoped API keys. In the POST /apikey endpoint, requests that supply app_id but omit org_id, limited_to_orgs, and expires_at resolve the target app and scope the key to it, but never add the app's owner organization to the list of organization IDs passed to validateExpirationAgainstOrgPolicies; because that list is empty, the validation returns early. As a result, an authenticated organization member can create a non-expiring app-scoped API key even when the owning organization has require_apikey_expiration enabled and a max_apikey_expiration_days limit configured. The issue is fixed in version 12.128.12.

Affected products

Cap-go capgo.app: before 12.128.12 — fixed in 12.128.12

How to fix

Upgrade to a fixed version: Cap-go capgo.app 12.128.12. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-100628 or the next vulnerability affects your stack