CVE-2026-16202 SourceCodester Class and Exam Timetabling System CYS.php cross site scripting
Remote attackers can inject malicious scripts via the course argument in CYS.php, potentially compromising user sessions and data.
- 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-2026-16202?
CVE-2026-16202 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 determined in SourceCodester Class and Exam Timetabling System 1.0. Affected by this vulnerability is an unknown functionality of the file /CYS.php. This manipulation of the argument course causes cross site scripting. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized.
Which versions are affected by CVE-2026-16202?
How do I fix CVE-2026-16202?
No fix has been published for CVE-2026-16202 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-2026-16202 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16202 exists.
Sources
Also known as GHSA-grp8-2555-3cmp.