CVE-2026-56331
MEDIUMCapgo - Improper Error Handling in Accept Invitation Endpoint via Invalid Magic String
Title source: cnaDescription
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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-34p8-fh3m-376x)
https://github.com/Cap-go/capgo/security/advisories/GHSA-34p8-fh3m-376x
Third Party Advisory third-party-advisory
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
Scores
CVSS v3
5.3
EPSS
0.0025
EPSS Percentile
16.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-209
Status
published
Products (2)
Capgo/Capgo
< 12.128.2
Capgo/Capgo
12.128.2
Published
Jun 30, 2026
Tracked Since
Jul 01, 2026