# CVE-2026-42099: Sparx Pro Cloud Server race condition in dl_internal_artifact.php

Source: https://junglewise.ai/threats/cve-2026-42099-sparx-pro-cloud-server-race-condition-in-dl-internal-artifact-php  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-19. Updated: 2026-05-19  
License: CC BY 4.0 with a link back

CVE-2026-42099 · Severity: info · CVSS 7.7 · Published 2026-05-19

Sparx Pro Cloud Server, a platform used to host and share Enterprise Architect models, contains a vulnerability that could allow an attacker to take full control of the server. By exploiting a timing issue during file processing, an authorized user can upload and execute malicious code. This could lead to the theft of sensitive architectural designs, data corruption, or a complete compromise of the server environment.

Technologies: [Sparx Systems Pro Cloud Server](https://junglewise.ai/threats/technologies/pro-cloud-server). Vendors: [Sparx Systems](https://junglewise.ai/threats/vendors/sparx-systems).

## Quick answers

**Is CVE-2026-42099 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-42099 being exploited in the wild.

**How severe is CVE-2026-42099?** Informational severity, with a CVSS score of 7.7, published 19 May 2026.

**Which products and versions are affected?** Sparx Systems Pro Cloud Server All versions through 6.1 (build 167).

**Is there a fix for CVE-2026-42099?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-42099 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-42099?** Check whether you run Sparx Systems Pro Cloud Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A race condition exists in the /data_api/dl_internal_artifact.php endpoint of Sparx Pro Cloud Server. The application downloads object properties based on a user-supplied GUID and temporarily saves the content to the local directory (__DIR__) using a user-controlled filename. While the application attempts to delete this file after processing, an attacker can exploit a race condition by delaying the response transmission (e.g., via a slow connection or large file). During this window, the attacker can send a second request to execute the newly created PHP file. Successful exploitation requires repository access but results in full remote code execution (RCE) under the context of the web server. Versions up to 6.1 (build 167) are confirmed vulnerable.

## Affected products

- Sparx Systems Pro Cloud Server All versions through 6.1 (build 167)

## Timeline

- 2026-05-19: advisory: Advisory published by CERT Polska
- 2026-05-19: disclosed

## References

- [https://cert.pl/en/posts/2026/05/CVE-2026-42096](https://cert.pl/en/posts/2026/05/CVE-2026-42096)
- [https://efigo.pl/blog/CVE-2026-42096/](https://efigo.pl/blog/CVE-2026-42096/)
- [https://sparxsystems.com/products/procloudserver/](https://sparxsystems.com/products/procloudserver/)
- [https://sploit.tech/2026/05/19/Sparx-Enterprise-Architect-PCS.html](https://sploit.tech/2026/05/19/Sparx-Enterprise-Architect-PCS.html)

## Related threats

- [Sparx Pro Cloud Server denial of service via invalid SQL query](https://junglewise.ai/threats/cve-2026-42100-sparx-pro-cloud-server-denial-of-service-via-invalid-sql-query)
- [Sparx Systems Pro Cloud Server authentication bypass via model parameter omission](https://junglewise.ai/threats/cve-2026-42097-sparx-systems-pro-cloud-server-authentication-bypass-via-model)
- [Sparx Systems Pro Cloud Server broken access control in database communication](https://junglewise.ai/threats/cve-2026-42096-sparx-systems-pro-cloud-server-broken-access-control-in-database)
- [Sparx Systems Pro Cloud Server SQL injection](https://junglewise.ai/threats/cve-2025-15625-sparx-systems-pro-cloud-server-sql-injection)
- [Sparx Systems Pro Cloud Server plaintext password storage in OpenID setup](https://junglewise.ai/threats/cve-2025-15624-sparx-systems-pro-cloud-server-plaintext-password-storage-in)