CVE-2026-56331: 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 inval
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-56331
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-563310.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-56331 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Capgo
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-56303: Capgo before 12.128.2 contains an information disclosure vulnerability in the find_apikey_by_v…nvd · 2026-07-11
- mediumCVE-2026-56240: Capgo before 12.128.12 contains a billing authorization bypass vulnerability in the plan_valid…nvd · 2026-07-11
- mediumCVE-2026-56335: Capgo before 12.128.2 contains an authorization bypass vulnerability where write-scoped API ke…nvd · 2026-07-10
- mediumCVE-2026-56329: Capgo before 12.128.2 contains a cross-tenant preview namespace collision vulnerability caused…nvd · 2026-07-10
- mediumCVE-2026-56312: Capgo before 12.128.2 contains an improper validation vulnerability in the accept_invitation e…nvd · 2026-07-10
- mediumCVE-2026-56309: Capgo before 12.128.2 fails to enforce plan/quota restrictions on the /files/upload/attachment…nvd · 2026-07-10
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