CVE-2023-25402Public exploitNetwork attack vector

Arbitrary file write via unfiltered upload suffix

Published Mar 3, 2023 · Updated Mar 6, 2025

Unrestricted file upload in CleverStupidDog yf-exam 1.8.0 allows remote attackers to write arbitrary files through the upload API. The /common/api/file/upload route passes each file through upload(), processPath(), and renameFile(), which directly concatenates an unfiltered suffix into the returned upload path. No authentication or user interaction is required, and the uploaded file is retrievable at that path, limiting the demonstrated consequence to arbitrary file placement and retrieval.

CVSS severity7.5
High
EPSS probability0.59%
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 CleverStupidDog yf-exam 1.8.0 allows remote attackers to write arbitrary files through the upload API. The /common/api/file/upload route passes each file through upload(), processPath(), and renameFile(), which directly concatenates an unfiltered suffix into the returned upload path. No authentication or user interaction is required, and the uploaded file is retrievable at that path, limiting the demonstrated consequence to arbitrary file placement and retrieval.

The record

CVE
CVE-2023-25402
Published
Mar 3, 2023
Updated
Mar 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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 exploitPublished

Weakness, pattern, technique

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

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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