FKIE_CVE-2026-40937
Vulnerability from fkie_nvd - Published: 2026-04-22 21:17 - Updated: 2026-04-24 13:12
Severity ?
Summary
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.
References
| URL | Tags | ||
|---|---|---|---|
| security-advisories@github.com | https://github.com/rustfs/rustfs/releases/tag/1.0.0-alpha.94 | Product, Release Notes | |
| security-advisories@github.com | https://github.com/rustfs/rustfs/security/advisories/GHSA-pfcq-4gjr-6gjm | Mitigation, Vendor Advisory |
Impacted products
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"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha90:*:*:*:rust:*:*",
"matchCriteriaId": "7F4D13A8-1A82-404C-93FA-AF94B7EC9D12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha91:*:*:*:rust:*:*",
"matchCriteriaId": "ED2FA642-2D41-4348-87B8-691F6FD3AC8A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha92:*:*:*:rust:*:*",
"matchCriteriaId": "4D0D8649-65A9-4044-903B-EAFB6C73AD1B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha93:*:*:*:rust:*:*",
"matchCriteriaId": "AEB051A2-5799-4C2C-AFE0-86851FFF0FF2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"id": "CVE-2026-40937",
"lastModified": "2026-04-24T13:12:29.780",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 8.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.5,
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
},
"published": "2026-04-22T21:17:08.877",
"references": [
{
"source": "security-advisories@github.com",
"tags": [
"Product",
"Release Notes"
],
"url": "https://github.com/rustfs/rustfs/releases/tag/1.0.0-alpha.94"
},
{
"source": "security-advisories@github.com",
"tags": [
"Mitigation",
"Vendor Advisory"
],
"url": "https://github.com/rustfs/rustfs/security/advisories/GHSA-pfcq-4gjr-6gjm"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-862"
}
],
"source": "security-advisories@github.com",
"type": "Primary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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