CVE-2026-16486Public exploitNetwork attack vector

Reflected XSS via unencoded day parameter

Published Jul 21, 2026 · Updated Jul 21, 2026

Reflected cross-site scripting in SourceCodester Class and Exam Timetabling System 1.0 allows remote attackers to run browser scripts. BSIS.php places the day parameter into the returned page without output encoding or filtering, causing supplied markup to execute as script. No authentication is required to inject the payload, but a victim must load the affected response; execution is limited to that victim's browser context.

CVSS severity4.3
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in SourceCodester Class and Exam Timetabling System 1.0 allows remote attackers to run browser scripts. BSIS.php places the day parameter into the returned page without output encoding or filtering, causing supplied markup to execute as script. No authentication is required to inject the payload, but a victim must load the affected response; execution is limited to that victim's browser context.

The record

CVE
CVE-2026-16486
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Online Computer and Laptop Store Project
Product
Class and Exam Timetabling System
Classifications
CWE-94, CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Online Computer and Laptop Store Project · Class and Exam Timetabling Systemversion=1.0

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:P/A:N
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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