CVE-2026-56331 | Capgo before 12.128.2 contains improper error handling in th… | CVSS 5.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-56331
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-20 13:06 UTC
Published: 2026-06-30 22:08 UTC
Last updated: 2026-06-30 22:08 UTC
Primary CWE: CWE-209
Generation of Error Message Containing Sensitive Information
Vendor / Product: Capgo / Capgo
Sources: cve.org · NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products (1)

Vendor	Product	Platform	Versions
Capgo	Capgo	—	0 < 12.128.2, 12.128.2

Weakness (CWE)

CWE	Source	Description
CWE-209	cna	Generation of Error Message Containing Sensitive Information

CVSS scores (2)

Score	Severity	Version	Source	Vector
6.9	MEDIUM	4.0	cna	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
5.3	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References (2)

GitHub Security Advisory (GHSA-34p8-fh3m-376x) https://github.com/Cap-go/capgo/security/advisories/GHSA-34p8-fh3m-376x
VulnCheck Advisory: Capgo - Improper Error Handling in Accept Invitation Endpoint via Invalid Magic String https://www.vulncheck.com/advisories/capgo-improper-error-handling-in-accept-invitation-endpoint-via-invalid-magic-string