CVE-2026-56331

Summary

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.

Affected Software

Weaknesses

• CWE-209: Generation of Error Message Containing Sensitive Information

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://github.com/Cap-go/capgo/security/advisories/GHSA-34p8-fh3m-376x

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-string

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