CVE-2026-56331

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.

Score

CVSS 4.0 6.9 Medium

Status

Deferred - disclosure@vulncheck.com

Published

2026-06-30

Last modified

2026-07-01

Weaknesses

CWE-209

Affected products

• Capgo (Capgo)

References

• https://github.com/Cap-go/capgo/security/advisories/GHSA-34p8-fh3m-376x
• https://www.vulncheck.com/advisories/capgo-improper-error-handling-in-accept-invitation-endpoint-via-invalid-magic-stri…