CVE-2026-42099 Race Condition in Sparx Pro Cloud Server

High 7.7 Published 19 May 2026 Updated 19 May 2026

An attacker with repository access can exploit a race condition to execute arbitrary PHP code on Sparx Pro Cloud Server.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-42099?

CVE-2026-42099 is a high-severity vulnerability in Sparx Systems Pro Cloud Server, published on 19 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-362

Which versions are affected by CVE-2026-42099?

It affects 1 product.

Products include Sparxsystems Pro Cloud Server.

How do I fix CVE-2026-42099?

No fix has been published for CVE-2026-42099 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-42099 being exploited?

There is no known exploitation of CVE-2026-42099 in the wild and no public exploit code.

Sources

Also known as GHSA-qff4-m3j5-xcv5.