CVE-2026-21625Network attack vector

Dangerous file upload via extension-only validation

Published Jan 16, 2026 · Updated Jan 16, 2026

Unrestricted file upload in StackIdeas EasyDiscuss 1.0.0 through 5.0.15 allows remote authenticated users to upload dangerous files. The Joomla component's upload handler accepts user-supplied files after checking only the filename extension, without validating the file's MIME type. A low-privileged account and active user interaction are required; the published record confirms file-type restriction bypass but does not establish server-side execution.

CVSS severity4.8
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in StackIdeas EasyDiscuss 1.0.0 through 5.0.15 allows remote authenticated users to upload dangerous files. The Joomla component's upload handler accepts user-supplied files after checking only the filename extension, without validating the file's MIME type. A low-privileged account and active user interaction are required; the published record confirms file-type restriction bypass but does not establish server-side execution.

The record

CVE
CVE-2026-21625
Published
Jan 16, 2026
Updated
Jan 16, 2026
Vendor
StackIdeas
Product
EasyDiscuss
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 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=1.0.0-5.0.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

StackIdeas · EasyDiscussversion=1.0.0-5.0.15

Published CVSS scores

4.8Joomla! ProjectCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

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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