CVE-2025-33015Network attack vector

Malicious file upload via missing content validation

Published Jan 20, 2026 · Updated Jan 20, 2026

Unrestricted file upload in IBM Concert 1.0.0 through 2.1.0 allows remote attackers to submit malicious files through its web interface. The upload path accepts file content without validating whether its type is safe, but IBM has not disclosed the affected endpoint or downstream file handling. Exploitation requires user interaction and no authentication; the published record reports confidentiality, integrity, and availability impact without specifying the resulting operation.

CVSS severity8.8
High
EPSS probability0.27%
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 IBM Concert 1.0.0 through 2.1.0 allows remote attackers to submit malicious files through its web interface. The upload path accepts file content without validating whether its type is safe, but IBM has not disclosed the affected endpoint or downstream file handling. Exploitation requires user interaction and no authentication; the published record reports confidentiality, integrity, and availability impact without specifying the resulting operation.

The record

CVE
CVE-2025-33015
Published
Jan 20, 2026
Updated
Jan 20, 2026
Vendor
IBM
Product
Concert
Classifications
CWE-434
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 20, 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 <=2.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Concertversion=1.0.0 <=2.1.0

Published CVSS scores

8.8IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type

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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