Pro Cloud Server: Improper Handling of Syntactically Invalid Structure
CVE-2026-42100 is a high-severity improper handling of syntactically invalid structure vulnerability in Pro Cloud Server from Sparx Systems, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Pro Cloud Server versions: 6.1 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.68% chance of exploitation within 30 days, higher than 53% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Pro Cloud Server you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Sparx Systems | Pro Cloud Server | 6.1 and earlier | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 7.1 | High | CNA (cert.pl) |
| CVSS 3.1 | 7.5 | High | NVD |
Official description
Improper Handling of Syntactically Invalid Structure in Sparx Pro Cloud Server allows Denial of Service (DoS) attack to be executed by sending an specially crafted SQL query. This causes the Pro Cloud Server service to terminate unexpectedly. 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: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Handling of Syntactically Invalid Structure
The product does not handle or incorrectly handles input that is not syntactically well-formed with respect to the associated specification.
More Improper Handling of Syntactically Invalid Structure vulnerabilities (CWE-228)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- cert.pl/en/posts/2026/05/CVE-2026-42096Third Party Advisory
- efigo.pl/blog/CVE-2026-42096/Third Party Advisory
Technical write-ups (may include proof of concept)
- sploit.tech/2026/05/19/Sparx-Enterprise-Architect-PCS.htmlExploit, Third Party Advisory
Other references
Other vulnerabilities in Pro Cloud Server
- 7.5 High severity
- 8.8 High severity
- 8.8 High severity
- 8.3 High severity
Recent Improper Handling of Syntactically Invalid Structure vulnerabilities
- 7.5 High severity
- 7.7 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.5 High severity
- 7.5 High severity
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