CVE-2025-63892Public exploitNetwork attack vector

Stored XSS via unsanitized classroom descriptions

Published Nov 18, 2025 · Updated Jul 5, 2026

Stored XSS in SourceCodester Student Grades Management System 1.0 allows remote authenticated users to execute JavaScript in viewers' browsers. The create_classroom function in /classroom.php stores unsanitized HTML from the Description field and renders it when the classroom page loads. Teacher-level access is required to create the payload, and execution requires an administrator or teacher to view the affected classroom page.

CVSS severity6.8
Medium
EPSS probability0.36%
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 Student Grades Management System 1.0 allows remote authenticated users to execute JavaScript in viewers' browsers. The create_classroom function in /classroom.php stores unsanitized HTML from the Description field and renders it when the classroom page loads. Teacher-level access is required to create the payload, and execution requires an administrator or teacher to view the affected classroom page.

The record

CVE
CVE-2025-63892
Published
Nov 18, 2025
Updated
Jul 5, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 5, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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