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CVE-2025-3519— Replace uploaded files knowing the file upload ID

Quick assessment

Affected
Unblu inc. Unblu Spark
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Unblu Spark是瑞士Unblu公司的一种以对话为核心的数字客户体验平台中的一个关键组件。 Unblu Spark存在安全漏洞，该漏洞源于对话参与者可替换已上传文件。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2025-3519

Vulnerability Information
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Vulnerability Title
Replace uploaded files knowing the file upload ID
Source: CVE Program / CVE List V5
Vulnerability Description
An authorization bypass in Unblu Spark allows a participant of a conversation to replace an existing, uploaded file. Every uploaded file in Unblu gets assigned with a randomly generated Universally Unique ID (UUID). In case a participant of this or another conversation gets access to such a file ID, it can be used to replace the file without changing the file name and details or the name of the user who uploaded the file. During the upload, file interception and allowed file type rules are still applied correctly.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Unblu Spark 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Unblu Spark是瑞士Unblu公司的一种以对话为核心的数字客户体验平台中的一个关键组件。 Unblu Spark存在安全漏洞，该漏洞源于对话参与者可替换已上传文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unblu inc. Unblu Spark 8.13.1 -

II. Public POCs for CVE-2025-3519

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III. Intelligence Information for CVE-2025-3519

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Vendor Pages for CVE-2025-3519 (1)

IV. Related Vulnerabilities

Same product: Unblu Spark
Same vendor: Unblu inc.
Same weakness: CWE-639

V. Comments for CVE-2025-3519

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