Quick answers
- Is CVE-2026-16203 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-16203 being exploited in the wild.
- How severe is CVE-2026-16203?
- Low severity, with a CVSS score of 3.5, published 19 July 2026.
- Which products and versions are affected?
- SourceCodester Class and Exam Timetabling System 1.0.
- Is there a fix for CVE-2026-16203?
- 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-2026-16203 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-16203?
- Check whether you run SourceCodester Class and Exam Timetabling System 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 reflected cross-site scripting (XSS) vulnerability exists in SourceCodester Class and Exam Timetabling System 1.0. The issue is located in the '/forCYS.php' file due to insufficient sanitization of the 'course' parameter. A remote attacker with low privileges can inject arbitrary JavaScript by manipulating this parameter, which is then rendered back to the user's browser without proper encoding. Successful exploitation allows the execution of malicious scripts in the context of the victim's session, potentially leading to session hijacking or unauthorized data access. A public exploit (Proof of Concept) is available.
Affected products
- SourceCodester Class and Exam Timetabling System 1.0
Timeline
- 2026-06-13: disclosed: Vulnerability reported on GitHub by zzb1388
- 2026-07-19: advisory: CVE published to NVD