CVE-2026-40937RustFS missing admin authorization on notification target endpoints, which allows unauthenticated configuration of event webhooks
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.3 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
- Weakness (CWE)
- CWE-862
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Apr 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
rustfs rustfs rustfs:rustfs (from the name) | before 1.0.0-alpha.94 | CNA record |
rustfs rustfs rustfs:rustfs | 1.0.0; 1.0.0; 1.0.0; 1.0.0; 1.0.0; 1.0.0; 1.0.0; 1.0.0; and 85 more ranges | NVD |
References
- https://github.com/rustfs/rustfs/security/advisories/GHSA-pfcq-4gjr-6gjmx-refsource-confirm, mitigation, vendor-advisory
- https://github.com/rustfs/rustfs/releases/tag/1.0.0-alpha.94x-refsource-misc, product, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.