PT-2026-54036 · Cap Go · Cap-Go

Judel777 · Published 2026-06-30 · Updated 2026-06-30 · CVE-2026-56331

Mitre

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Capgo before 12.128.2 contains improper error handling in the /private/accept invitation endpoint that returns HTTP 500 instead of safe 4xx errors when magic invite string is invalid. Attackers can trigger this vulnerability using only the public key by submitting malformed magic invite string values to cause server errors and leak internal processing details.

Fix

Generation of Error Message Containing Sensitive Information

Weakness Enumeration

CWE-209

Related Identifiers

CVE-2026-56331

Affected Products

Cap-Go

References · 3

• https://github.com/Cap-go/capgo/security/advisories/GHSA-34p8-fh3m-376x · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-56331 · Security Note
• https://vulncheck.com/advisories/capgo-improper-error-handling-in-accept-invitation-endpoint-via-invalid-magic-string · Note