CVE-2026-56331

6.9 mediumEPSS 0.3%

Medium (6.9). EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 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

CVSS 3.1

5.3 medium

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-31)
CWE: CWE-209
Published: 2026-06-30
Modified: 2026-07-01
Record from: the NVD, synced 2026-10-19

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

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