CVE-2026-64972Network attack vector

Authenticated script execution via popup attribute injection

Published Aug 20, 2026 · Updated Aug 20, 2026

Reflected XSS in preview.php in ATutor 2.2.4 allows remote authenticated users to execute script in a victim browser via the popup parameter. The preview.php frameset reflects popup into an HTML attribute without encoding quotation marks, so an injected double quote breaks attribute context and appends a handler such as onload; preview_top.php sanitization does not protect the parent frameset output. Reachability requires an authenticated attacker to induce another user to load the crafted request, and the exposed consequence is script execution in the ATutor origin with the victim's session context.

CVSS severity4.8
Medium
EPSS probability0.29%
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 preview.php in ATutor 2.2.4 allows remote authenticated users to execute script in a victim browser via the popup parameter. The preview.php frameset reflects popup into an HTML attribute without encoding quotation marks, so an injected double quote breaks attribute context and appends a handler such as onload; preview_top.php sanitization does not protect the parent frameset output. Reachability requires an authenticated attacker to induce another user to load the crafted request, and the exposed consequence is script execution in the ATutor origin with the victim's session context.

The record

CVE
CVE-2026-64972
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
ATutor
Product
ATutor
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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=2.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ATutor · ATutorversion=2.2.4

Published CVSS scores

4.8CERT.PLCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript

Public exploit references

No public exploit references are available in this record.

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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