CVE-2026-56331

Capgo - Improper Error Handling in Accept Invitation Endpoint via Invalid Magic String

State: Published
Severity: 6.9 Medium
Published: Jun 30, 2026
Updated: Jul 1, 2026
Reserved: Jun 20, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	VulnCheck

Weaknesses

CWE-209 Generation of Error Message Containing Sensitive Information

Affected Products

Product	Versions
CapgoCapgo	before 12.128.2Affected 12.128.2Not affected

References

GitHub Security Advisory (GHSA-34p8-fh3m-376x)vendor-advisory
VulnCheck Advisory: Capgo - Improper Error Handling in Accept Invitation Endpoint via Invalid Magic Stringthird-party-advisory

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