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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
CRITICAL 9.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-15
Original CVE updated
2026-06-16
Advisory published
2026-06-15
Advisory updated
2026-06-16

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50886 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50886

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50886 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50886

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.