CVE-2026-56303
Unauthenticated API exposes API-key metadata in Capgo <12.128.2
Is CVE-2026-56303 being exploited?
Not confirmed. CVE-2026-56303 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-56303?
CVE-2026-56303 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-56303?
Yes. A fix has been recorded for CVE-2026-56303. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-56303 affect?
CVE-2026-56303 affects Capgo < 12.128.2, PostgreSQL SECURITY DEFINER function find_apikey_by_value, /rest/v1/rpc/find_apikey_by_value endpoint. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-56303?
Upgrade to 12.128.2; rotate/revoke keys; remove anon exec rights or restrict RPC access
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated RPC returns API key metadata (user_id, mode, org scope, expiry), enabling key validation, reconnaissance and potential misuse.
Patch when possible
- affected< 12.128.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.