CVE-2026-50886
Incorrect access control in Firefly III webhook enables internal resource scanning via POST.
Is CVE-2026-50886 being exploited?
Not confirmed. CVE-2026-50886 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.31% probability of exploitation in the next 30 days.
How severe is CVE-2026-50886?
CVE-2026-50886 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-50886?
Not known from our data. No patch reference has been recorded for CVE-2026-50886, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-50886 affect?
CVE-2026-50886 affects Project Firefly III v6.5.9 (webhook management component). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-50886?
Upgrade when patch is released; restrict webhook access and auth.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Webhook access control flaw allows scanning internal resources via crafted POST; potential data exposure and internal recon.
Patch when possible