FKIE_CVE-2026-33173
Vulnerability from fkie_nvd - Published: 2026-03-24 00:16 - Updated: 2026-03-24 17:56
Severity ?
Summary
Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, `DirectUploadsController` accepts arbitrary metadata from the client and persists it on the blob. Because internal flags like `identified` and `analyzed` are stored in the same metadata hash, a direct-upload client can set these flags to skip MIME detection and analysis. This allows an attacker to upload arbitrary content while claiming a safe `content_type`, bypassing any validations that rely on Active Storage's automatic content type identification. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| rubyonrails | rails | * | |
| rubyonrails | rails | * | |
| rubyonrails | rails | * |
{
"configurations": [
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"nodes": [
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"value": "Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, `DirectUploadsController` accepts arbitrary metadata from the client and persists it on the blob. Because internal flags like `identified` and `analyzed` are stored in the same metadata hash, a direct-upload client can set these flags to skip MIME detection and analysis. This allows an attacker to upload arbitrary content while claiming a safe `content_type`, bypassing any validations that rely on Active Storage\u0027s automatic content type identification. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch."
},
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"lang": "es",
"value": "Active Storage permite a los usuarios adjuntar archivos locales y en la nube en aplicaciones Rails. Antes de las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1, \u0027DirectUploadsController\u0027 acepta metadatos arbitrarios del cliente y los persiste en el blob. Debido a que indicadores internos como \u0027identified\u0027 y \u0027analyzed\u0027 se almacenan en el mismo hash de metadatos, un cliente de carga directa puede establecer estos indicadores para omitir la detecci\u00f3n y el an\u00e1lisis MIME. Esto permite a un atacante cargar contenido arbitrario mientras declara un \u0027content_type\u0027 seguro, eludiendo cualquier validaci\u00f3n que dependa de la identificaci\u00f3n autom\u00e1tica del tipo de contenido de Active Storage. Las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1 contienen un parche."
}
],
"id": "CVE-2026-33173",
"lastModified": "2026-03-24T17:56:09.113",
"metrics": {
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"version": "3.1"
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"Recovery": "NOT_DEFINED",
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"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
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"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
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"userInteraction": "PASSIVE",
"valueDensity": "NOT_DEFINED",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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"type": "Secondary"
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"published": "2026-03-24T00:16:28.457",
"references": [
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"source": "security-advisories@github.com",
"tags": [
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"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Analyzed",
"weaknesses": [
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"lang": "en",
"value": "CWE-925"
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"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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