PatchSiren cyber security CVE debrief

CVE-2026-50886 Project Firefly III CVE debrief

CVE-2026-50886 is an incorrect access control vulnerability in the webhook management component of Project Firefly III v6.5.9. This vulnerability allows attackers to scan internal resources via a crafted POST request. The CVE was published and modified on June 15, 2026, at 20:16:31.580Z.

Vendor: Project Firefly III
Product: Project Firefly III
CVSS: Unknown
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-15
Original CVE updated: 2026-06-15
Advisory published: 2026-06-15
Advisory updated: 2026-06-15

Who should care

Users of Project Firefly III v6.5.9 should be aware of this vulnerability and take necessary actions to secure their installations.

Technical summary

The vulnerability is caused by incorrect access control in the webhook management component of Project Firefly III v6.5.9. This allows attackers to scan internal resources by sending a crafted POST request.

Defensive priority

High

Recommended defensive actions

Update to a patched version of Project Firefly III, if available.
Restrict access to the webhook management component to authorized users only.
Monitor the system for suspicious activity.

Evidence notes

The CVE record [resourceLinkAnnotations:cve-org] and NVD detail [resourceLinkAnnotations:nvd] provide official information about this vulnerability. A source reference [resourceLinkAnnotations:ref-4] is also available.

Official resources

CVE-2026-50886 was published and modified on June 15, 2026.