CVE-2026-42099
Race Condition in Sparx Pro Cloud Server
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.
INFO
Published Date :
May 19, 2026, 2:16 p.m.
Last Modified :
June 2, 2026, 2:23 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 4bb8329e-dd38-46c1-aafb-9bf32bcb93c6 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update the application to a non-vulnerable version.
- Apply vendor patches when available.
- Restrict access to the affected endpoint.
- Monitor for unexpected file creation.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42099.
| URL | Resource |
|---|---|
| https://cert.pl/en/posts/2026/05/CVE-2026-42096 | Third Party Advisory |
| https://efigo.pl/blog/CVE-2026-42096/ | Third Party Advisory |
| https://sparxsystems.com/products/procloudserver/ | Product |
| https://sploit.tech/2026/05/19/Sparx-Enterprise-Architect-PCS.html | Exploit Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42099 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42099
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42099 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42099 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:sparxsystems:pro_cloud_server:*:*:*:*:*:*:*:* versions up to (including) 6.1.167 Added Reference Type CERT.PL: https://cert.pl/en/posts/2026/05/CVE-2026-42096 Types: Third Party Advisory Added Reference Type CERT.PL: https://efigo.pl/blog/CVE-2026-42096/ Types: Third Party Advisory Added Reference Type CERT.PL: https://sparxsystems.com/products/procloudserver/ Types: Product Added Reference Type CERT.PL: https://sploit.tech/2026/05/19/Sparx-Enterprise-Architect-PCS.html Types: Exploit, Third Party Advisory -
New CVE Received by [email protected]
May. 19, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-362 Added Reference https://cert.pl/en/posts/2026/05/CVE-2026-42096 Added Reference https://efigo.pl/blog/CVE-2026-42096/ Added Reference https://sparxsystems.com/products/procloudserver/ Added Reference https://sploit.tech/2026/05/19/Sparx-Enterprise-Architect-PCS.html