CVE-2026-42099— Race Condition in Sparx Pro Cloud Server
Quick assessment
Affected
Sparx Systems Pro Cloud Server
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.
Sparx Systems Sparx Pro Cloud Server是澳大利亚Sparx Systems公司的一款支持模型仓库远程访问与协作管理的建模服务平台。 Sparx Pro Cloud Server 6.1版本及之前版本存在竞争条件问题漏洞，该漏洞源于/data_api/dl_internal_artifact.php端点存在竞争条件，攻击者可以控制文件名和文件内容，导致远程代码执行。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Sparx Systems | Pro Cloud Server | ≤ 6.1 |
affected |
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I. Basic Information for CVE-2026-42099
Vulnerability Information
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Vulnerability Title
Race Condition in Sparx Pro Cloud Server
Source: CVE Program / CVE List V5
Vulnerability Description
Sparx Pro Cloud Server is vulnerable to a Race Condition in the /data_api/dl_internal_artifact.php endpoint. The application downloads the properties of the object pointed by guid parameter and saves loaded content in current location (__DIR__) under the specified name. An attacker with repository access can control both the filename and file contents, allowing the creation of a malicious PHP file in a current directory. Although the file is deleted after processing, a race condition exists: if the response transmission is delayed (e.g., via a large file or slow client connection), the file remains accessible. During this window, the attacker can issue a second request to execute the malicious PHP file, resulting in remote code execution.
The vendor was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Only version 6.1 (build 167) and below were tested and confirmed as vulnerable, other versions were not tested and might also be vulnerable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Sparx Systems Sparx Pro Cloud Server 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sparx Systems Sparx Pro Cloud Server是澳大利亚Sparx Systems公司的一款支持模型仓库远程访问与协作管理的建模服务平台。 Sparx Pro Cloud Server 6.1版本及之前版本存在竞争条件问题漏洞，该漏洞源于/data_api/dl_internal_artifact.php端点存在竞争条件，攻击者可以控制文件名和文件内容，导致远程代码执行。
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 |
|---|---|---|---|---|
| Sparx Systems | Pro Cloud Server | 0 ~ 6.1 | - |
|
II. Public POCs for CVE-2026-42099
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-42099 (1)
Security Blog Posts for CVE-2026-42099 (2)
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🔗 CVE-2026-42096 - EFIGO - Cyberbezpieczeństwo i ochrona danych Read full article third-party-advisory
Vendor Pages for CVE-2026-42099 (1)
Same Patch Batch · Sparx Systems · 2026-05-19 · 5 CVEs total
| CVE-2026-42100 | DoS in Sparx Pro Cloud Server | |
| CVE-2026-42096 | Broken Access Control in Sparx Pro Cloud Server | |
| CVE-2026-42098 | Authorization Bypass in Sparx Enterprise Architect | |
| CVE-2026-42097 | Authentication Bypass in Sparx Pro Cloud Server |
IV. Related Vulnerabilities
Same product: Pro Cloud Server
-
CVE-2026-42100
DoS in Sparx Pro Cloud Server -
CVE-2026-42097
Authentication Bypass in Sparx Pro Cloud Server -
CVE-2026-42096
Broken Access Control in Sparx Pro Cloud Server -
CVE-2025-4377
Path traversal vulnerability in Sparx Pro Cloud Server WebEA -
CVE-2025-4376
Cross-Site Scripting vulnerability in Model Search in Pro Cl
Same vendor: Sparx Systems
-
CVE-2026-42100
DoS in Sparx Pro Cloud Server -
CVE-2026-42098
Authorization Bypass in Sparx Enterprise Architect -
CVE-2026-42097
Authentication Bypass in Sparx Pro Cloud Server -
CVE-2026-42096
Broken Access Control in Sparx Pro Cloud Server -
CVE-2025-4377
Path traversal vulnerability in Sparx Pro Cloud Server WebEA
Same weakness: CWE-362
-
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WordPress Booking Calendar plugin <= 11.8.4 - Race Condition -
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CVE-2026-103282
Ghost 0.5.0 before 6.23.0 Multiple Account Creation via Invi
V. Comments for CVE-2026-42099
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