CVE-2026-1126Public exploitNetwork attack vector

Authenticated arbitrary file upload via uploadFile

Published Jan 18, 2026 · Updated Jan 18, 2026

Unrestricted file upload in Liu Wenjun Flow's SVG File Handler allows remote authenticated users to place arbitrary files on the server. The uploadFile method in flow-front-rest/src/main/java/com/dragon/flow/web/resource/flow/FormResource.java accepts the File argument without restricting uploaded file types. A low-privilege authenticated session is required; successful uploads can alter server-hosted content, while code execution is not established by the published record.

CVSS severity6.3
Medium
EPSS probability0.26%
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 Liu Wenjun Flow's SVG File Handler allows remote authenticated users to place arbitrary files on the server. The uploadFile method in flow-front-rest/src/main/java/com/dragon/flow/web/resource/flow/FormResource.java accepts the File argument without restricting uploaded file types. A low-privilege authenticated session is required; successful uploads can alter server-hosted content, while code execution is not established by the published record.

The record

CVE
CVE-2026-1126
Published
Jan 18, 2026
Updated
Jan 18, 2026
Vendor
Liu Wenjun
Product
Flow
Classifications
CWE-434, CWE-284, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 18, 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?

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  1. Affected versionversion=a3d2fe8133db9d3b50fda4f66f68634640344641

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Liu Wenjun · Flowversion=a3d2fe8133db9d3b50fda4f66f68634640344641

Published CVSS scores

6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
2.1NVDCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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.

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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 exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-284Improper Access Control
T1105Ingress Tool Transfer

Public exploit references

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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