Project Firefly III has incorrect access control in the webhook management component (CVE-2026-50886) | HOL Guard CVE

Critical · CVSS 9.1CVE-2026-50886GHSA-9MMG-Q95P-GP67

Project Firefly III has incorrect access control in the webhook management component

Answer in brief

CVE-2026-50886 records a Critical severity (CVSS 9.1) vulnerability in Project Firefly III has incorrect access control in the webhook management component. The current sources do not mark it as known exploited. The current feed maps grumpydictator/firefly-iii (composer). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 15, 2026Updated Aug 27, 2026Source checked Aug 27, 2026First seen by HOL Aug 27, 2026Material review Aug 27, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps grumpydictator/firefly-iii (composer). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
grumpydictator/firefly-iiicomposer	<=6.5.9	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for grumpydictator/firefly-iii.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 15, 2026
Evidence: source:ghsa:source_dates:source-dates:record
Source modified
Aug 27, 2026
Evidence: source:ghsa:source_dates:source-dates:record
First seen by HOL
Aug 27, 2026

Sources and claim methodology

Upstream source description

Incorrect 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.

Quoted source text, attributed separately from HOL analysis.