CVE-2026-56331
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedCapgo 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceCapgo before version 12.128.2 has improper error handling in the /private/accept_invitation endpoint. When a malformed magic_invite_string is submitted, the server returns an HTTP 500 error instead of a safe 4xx error. This leaks internal processing details to attackers who only need the public key to exploit the vulnerability.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed Capgo versionLocate the package.json, package-lock.json, or running service to determine the currently deployed version of Capgo. Use commands like 'npm list capgo', check your dependency lock file, or query the service's version endpoint if available.Affected if The installed version is earlier than 12.128.2
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Verify the /private/accept_invitation endpoint responseSend a POST request to the /private/accept_invitation endpoint with a malformed magic_invite_string (e.g., empty string, invalid format, or garbled data). Inspect the HTTP status code returned in the response.Affected if The endpoint returns HTTP 500 Internal Server Error instead of a 4xx status code (400, 401, or similar)
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Inspect error response contentsExamine the response body from the malformed request to the /private/accept_invitation endpoint. Look for stack traces, database queries, internal paths, configuration values, or other processing details that should not be exposed.Affected if The error response contains internal processing details such as stack traces, SQL queries, file paths, or sensitive configuration information
You are affected if you are running Capgo before version 12.128.2 and the /private/accept_invitation endpoint returns HTTP 500 or exposes internal details when given a malformed magic_invite_string.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedImplement proper error handling to return appropriate 4xx status codes (such as 400 Bad Request or 401 Unauthorized) when the magic_invite_string is invalid, and ensure internal processing details are not exposed in error responses.
Capgo version 12.128.2 or later
- 1. Identify the current installed version of Capgo in your environment
- 2. Upgrade Capgo to version 12.128.2 or later
- 3. Verify the upgrade was successful by checking the version number
- 4. Test the /private/accept_invitation endpoint with invalid magic_invite_string to confirm it now returns proper 4xx error instead of 500
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-56331 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-56331 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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