CVE-2026-16203 SourceCodester Class and Exam Timetabling System forCYS.php cross site scripting
Remote attackers can inject malicious scripts via the course argument in forCYS.php, potentially compromising user sessions or executing code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-16203?
CVE-2026-16203 is a medium-severity cross-site scripting vulnerability in SourceCodester Class and Exam Timetabling System, published on 19 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A vulnerability was identified in SourceCodester Class and Exam Timetabling System 1.0. Affected by this issue is some unknown functionality of the file /forCYS.php. Such manipulation of the argument course leads to cross site scripting. The attack may be performed from remote. The exploit is publicly available and might be used.
Which versions are affected by CVE-2026-16203?
How do I fix CVE-2026-16203?
No fix has been published for CVE-2026-16203 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-16203 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16203 exists.
Sources
Also known as GHSA-5frv-67vm-973m.