# CVE-2026-16155 — SourceCodester Class and Exam Timetabling System

> As of 2026-07-18, CVE-2026-16155 is a LOW-severity vulnerability in SourceCodester Class and Exam Timetabling System, CVSS v3.1 3.5, EPSS 0.1% (9.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-16155 as of 2026-07-18; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-18

## What is CVE-2026-16155?

A vulnerability was identified in SourceCodester Class and Exam Timetabling System 1.0. Affected by this issue is some unknown functionality of the file /schoolyr.php. The manipulation of the argument sy leads to cross site scripting. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.

The record classifies CVE-2026-16155 under weakness classes [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79), [CWE-94](https://intel.threadlinqs.com/cwe/CWE-94). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 79 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 3.5 — LOW (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 9.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-18

## Is CVE-2026-16155 being exploited?

It currently carries a trending score of 32 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [SourceCodester](https://intel.threadlinqs.com/vendors/sourcecodester): Class and Exam Timetabling System

## How to fix CVE-2026-16155

No vendor patch reference has been recorded for CVE-2026-16155 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-16155

No threat campaign in the Threadlinqs corpus currently references CVE-2026-16155, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-20.

**Exploit and proof of concept**

- [github.com — exploit](https://github.com/justconter/cve/issues/4)

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/379920)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/379920/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-16155)
- [vuldb.com — third party advisory (857080)](https://vuldb.com/submit/857080)

**Issue tracking and product pages**

- [sourcecodester.com — product](https://www.sourcecodester.com/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-16155
Full detection coverage and IOCs for threats exploiting CVE-2026-16155 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp