Public vulnerability disclosure
CVE-2026-40937
CVE-2026-40937
publishedCWE-862
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.
Technical severity8.3 highCVSS 3.1 · NVD: [email protected]
Published2026-04-22Source updated 2026-11-11
Collected2026-11-122 attributed sources
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| rustfs rustfs |
1.0.0 (affected, custom) | NVD |
rustfsrustfs
crates.io |
≥ 0; ≤ 0.0.2 (affected, semver); OSV events: introduced 0; last affected 0.0.2Source events (semver)Other versions: unaffected |
OSV GHSA-pfcq-4gjr-6gjm |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
NVD applicability configurations (1)
These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.
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]CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 8.3 high |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/rustfs/rustfs/releases/tag/1.0.0-alpha.94[email protected] · Product, Release Notes
- https://github.com/rustfs/rustfs/security/advisories/GHSA-pfcq-4gjr-6gjm[email protected] · Mitigation, Vendor Advisory
- https://github.com/advisories/GHSA-pfcq-4gjr-6gjmOSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-pfcq-4gjr-6gjmOSV / GitHub Security Advisories · osv
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