CVE-2026-50886
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 · uneditedIncorrect access control in the webhook management component of Project Firefly III v6.5.9 allows attackers to scan internal resources via a crafted POST request.
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 · moderate confidenceThis vulnerability in Project Firefly III v6.5.9 involves incorrect access control in the webhook management component, allowing authenticated or unauthenticated attackers to make the server send crafted POST requests to internal resources. This is a Server-Side Request Forgery (SSRF) flaw where the webhook feature lacks proper authorization checks, enabling attackers to probe internal networks, cloud metadata services, or localhost interfaces that should be inaccessible.
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
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 Firefly III versionCheck the version number in your Firefly III installation (typically found in the admin panel, or in the composer.json/version file of the installation directory)Affected if The installed version is 6.5.9 or if it falls within the affected range around 6.5.9 (verify against official release notes)
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Determine if webhook feature is enabledLook for webhook configuration in Firefly III admin settings or configuration files (check config files like .env for WEBHOOK_ENABLED or similar settings)Affected if The webhook feature is enabled and accessible to authenticated or unauthenticated users
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Inspect webhook URL configurationReview the webhook endpoint configurations in the admin panel or configuration files to see if URL allowlisting is implementedAffected if There is no URL allowlist restricting webhook destinations, or the allowlist permits internal/private IP ranges
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Check authentication on webhook management endpointsTest access to webhook creation/modification endpoints without authentication, or review the authentication middleware configuration for these routesAffected if Webhook management endpoints are accessible without proper authentication or authorization checks
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Verify network access from application serverReview firewall rules or network configuration to determine if the application server can initiate outbound connections to internal resources, cloud metadata endpoints (e.g., 169.254.169.254), or private IP rangesAffected if The server can make outbound HTTP requests to internal networks, localhost, or cloud metadata services
A user is affected if running Firefly III version 6.5.9 with the webhook feature enabled and without URL allowlisting or proper authentication controls on webhook endpoints.
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.
From vendor dataRestrict webhook URL destinations to explicitly allowed domains/IPs via an allowlist, implement strict authentication and role-based access controls on the webhook management endpoints, and apply network segmentation to prevent the application server from initiating arbitrary outbound connections.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-50886 — 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-2026-50886 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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