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

CRITICAL 9.1CVE-2026-50886 · GHSA-9mmg-q95p-gp67 · Published 15/06/2026 · updated 17/06/2026

In short

CVE-2026-50886 is a CRITICAL (CVSS 9.1) vulnerability affecting grumpydictator/firefly-iii.
Chance of exploitation in the next 30 days (EPSS): 0.31%, higher than 24.1% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
grumpydictator/firefly-iii Packagist	`≤ 6.5.9`	No fix yet

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.

NVD 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.

References

nvd.nist.gov/vuln/detail/CVE-2026-50886 · ADVISORY
gist.github.com/pyuysig/f5395f90753ba652835ba9c6abf4c4ae · WEB
firefly-iii/firefly-iii · PACKAGE

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Package

Affected versions

Patched versions

grumpydictator/firefly-iii

Packagist

≤ 6.5.9

No fix yet

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.

NVD 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.

More vulnerabilities in grumpydictator/firefly-iii

See all →