Is CVE-2026-40937 actively exploited?

No active exploitation of CVE-2026-40937 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40937 be exploited remotely?

Yes. CVE-2026-40937 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40937?

CVE-2026-40937 has a CVSS score of 8.3 (HIGH).

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HIGH

CVE-2026-40937

CWE-862Published: April 22, 2026· Updated: Apr 24, 2026

8.3

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:15.4th

Official Description

RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-alpha.94, all four notification target admin API endpoints in `rustfs/src/admin/handlers/event.rs` use a `check_permissions` helper that validates authentication only (access key + session token), without performing any admin-action authorization via `validate_admin_request`. Every other admin handler in the codebase correctly calls `validate_admin_request` with a specific `AdminAction`. This is the only admin handler file that skips authorization. A non-admin user can overwrite a shared admin-defined notification target by name, causing subsequent bucket events to be delivered to an attacker-controlled endpoint. This enables cross-user event interception and audit evasion. 1.0.0-alpha.94 contains a patch.

NVD Source

Technical Analysis

CVE-2026-40937 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.3.