CVE-2026-65461Network attack vector

Administrator arbitrary file upload via unchecked MIME validation

Published Jul 23, 2026 · Updated Jul 23, 2026

Arbitrary file upload in Really Simple CSV Importer 1.3 and earlier allows remote authenticated users to store disallowed files via CSV import. The attachment and thumbnail paths accept post_thumbnail or media_file values and persist fetched or local files without rejecting empty or disallowed MIME results. Administrator access to Tools > Import is required; a crafted CSV can place attacker-selected content in WordPress uploads, where server handling determines executability.

CVSS severity9.1
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Really Simple CSV Importer 1.3 and earlier allows remote authenticated users to store disallowed files via CSV import. The attachment and thumbnail paths accept post_thumbnail or media_file values and persist fetched or local files without rejecting empty or disallowed MIME results. Administrator access to Tools > Import is required; a crafted CSV can place attacker-selected content in WordPress uploads, where server handling determines executability.

The record

CVE
CVE-2026-65461
Published
Jul 23, 2026
Updated
Jul 23, 2026
Vendor
株式会社Webの相談所
Product
Really Simple CSV Importer
Classifications
CWE-434, T1105
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=1.3 changes=[{"at":"1.3.1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

株式会社Webの相談所 · Really Simple CSV Importerversion=n/a <=1.3 changes=[{"at":"1.3.1","status":"unaffected"}]

Published CVSS scores

9.1PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1105Ingress Tool Transfer

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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