CVE-2026-40784
Authorization bypass via user-controlled key in FluentBoards <=1.91.2
Is CVE-2026-40784 being exploited?
Not confirmed. CVE-2026-40784 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 0.17% probability of exploitation in the next 30 days.
How severe is CVE-2026-40784?
CVE-2026-40784 is rated High with a CVSS score of 8.1. 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-2026-40784?
Not known from our data. No patch reference has been recorded for CVE-2026-40784, 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-2026-40784 affect?
CVE-2026-40784 affects FluentBoards, fluent-boards <= 1.91.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40784?
Upgrade to latest FluentBoards; review ACL settings
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bypasses access controls with a user-controlled key; attacker can access restricted features and potentially escalate privileges.
Patch when possible
- affected<= 1.91.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.