CVE-2026-40937
Auth bypass in RustFS admin event endpoints allows non-admins to hijack notifications.
Is CVE-2026-40937 being exploited?
Not confirmed. CVE-2026-40937 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 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-40937?
CVE-2026-40937 is rated High with a CVSS score of 8.3. 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-2026-40937?
Yes. A fix has been recorded for CVE-2026-40937. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40937 affect?
CVE-2026-40937 affects RustFS < 1.0.0-alpha.94. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40937?
Patch to 1.0.0-alpha.94 or newer; enforce admin action validation.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Non-admin can overwrite admin-defined notification target; bucket events are sent to attacker-controlled endpoint, enabling interception and audit evasion.
Immediate action required
- affected< 1.0.0-alpha.94
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.