CVE-2026-56249
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 an authorization bypass vulnerability in the channel creation endpoint that allows authenticated users to overwrite existing channels by reusing their names. Attackers with app.create_channel permission can exploit a logic mismatch between existence validation and upsert operations to reassign channel ownership and modify critical production channel configurations.
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 12.128.2 has an authorization bypass in the channel creation endpoint where a logic mismatch between existence validation and upsert operations allows authenticated users with app.create_channel permission to overwrite existing channels by reusing names. This enables attackers to reassign channel ownership and modify production channel configurations.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- High
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
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 Capgo versionRetrieve the installed Capgo version from the application dashboard, package.json, or by querying the API endpoint that returns version information (e.g., GET /api/version or checking the admin interface). Compare the version number to the affected range: any version before 12.128.2 is vulnerable.Affected if The installed version is Capgo below 12.128.2
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Verify app.create_channel permission existsQuery the user or role permissions configuration in Capgo to determine if the app.create_channel permission is defined and granted to any user or role.Affected if The app.create_channel permission exists and is assignable to users
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Check for channel overwrites via duplicate namesReview the channel creation audit logs or history for entries where channel names were reused. Look for unexpected ownership changes on existing channels, especially production channels, by querying the channels endpoint and comparing current ownership against baseline records.Affected if Channel audit logs show creation attempts with existing channel names resulting in ownership reassignment
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Inspect channel ownership configurationsQuery the channels API endpoint (e.g., GET /api/channels) to retrieve all channel records and examine the owner field for each channel. Identify any channels where the owner differs from the expected legitimate owner, particularly for production channels.Affected if Any channel shows an unexpected or unauthorized owner, especially on production channels
A user is affected if they run a Capgo version below 12.128.2 and have the app.create_channel permission enabled, allowing potential unauthorized channel ownership changes to be created or detected in audit logs.
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 · scopedUpgrade to Capgo version 12.128.2 or later. Audit existing channel configurations for unauthorized ownership changes and review access controls around channel management.
Capgo version 12.128.2 or later
- 1. Identify the current installed version of Capgo in your environment
- 2. If the current version is below 12.128.2, plan for an upgrade to version 12.128.2 or later
- 3. Review existing channel configurations to verify no unauthorized modifications have occurred
- 4. After upgrading, test the channel creation endpoint to confirm the authorization bypass is fixed (existing channel names should now be rejected rather than overwritten)
- 5. Audit logs for any suspicious channel creation or modification activity that may have exploited this vulnerability
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-56249 — 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-2026-56249 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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