CVE-2026-4973Public exploitNetwork attack vector

Stored script execution via unencoded quiz questions

Published Mar 27, 2026 · Updated Mar 27, 2026

Stored XSS in SourceCodester Online Quiz System 1.0 allows remote authenticated users to inject scripts through crafted quiz questions. The endpoint copies quiz_question from POST into the database, and quiz.php and take-quiz.php render the stored value without HTML encoding. Teacher-level access is required; the script then runs in any student or teacher browser that displays the affected quiz, enabling actions in that user's session.

CVSS severity3.5
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in SourceCodester Online Quiz System 1.0 allows remote authenticated users to inject scripts through crafted quiz questions. The endpoint copies quiz_question from POST into the database, and quiz.php and take-quiz.php render the stored value without HTML encoding. Teacher-level access is required; the script then runs in any student or teacher browser that displays the affected quiz, enabling actions in that user's session.

The record

CVE
CVE-2026-4973
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
Online Computer and Laptop Store Project
Product
Online Quiz System
Classifications
CWE-94, CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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 privilegesauthenticated

What is affected?

Online Computer and Laptop Store Project · Online Quiz Systemversion=1.0

Published CVSS scores

2.0VulDBCVSS: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
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
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')
T1059.007JavaScript/JScript

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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