CVE-2025-28121Public exploitNetwork attack vector

Reflected XSS via unsanitized q parameter

Published Apr 21, 2025 · Updated Apr 21, 2025

Reflected XSS in feedback.php in code-projects Online Exam Mastering System 1.0 allows remote attackers to run script via q. The endpoint reflects the q value into its HTML response without sanitization or output encoding, so supplied script markup executes in the visitor's browser. Exploitation requires a user to open a crafted URL; execution is confined to the application's browser origin, enabling session-data theft or actions as the victim.

CVSS severity6.1
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in feedback.php in code-projects Online Exam Mastering System 1.0 allows remote attackers to run script via q. The endpoint reflects the q value into its HTML response without sanitization or output encoding, so supplied script markup executes in the visitor's browser. Exploitation requires a user to open a crafted URL; execution is confined to the application's browser origin, enabling session-data theft or actions as the victim.

The record

CVE
CVE-2025-28121
Published
Apr 21, 2025
Updated
Apr 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

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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