EUVD-2026-63373
GHSA-2fm5-jp2h-3vgh
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-delivered reflected XSS requiring authentication and victim interaction, with scope change to victim browser; no server confidentiality or availability impact.
Primary rating from Vendor (cert).
CVSS VectorVendor: cert
Lifecycle Timeline
1DescriptionCVE.org
ATutor is vulnerable to Reflected XSS via popup parameter in preview.php. An authenticated attacker can inject a double quote into the popup parameter, break out of the attribute value, and append a new event handler such as onload. The related preview_top.php file sanitises these parameters, but that does not prevent XSS in the parent frameset rendered by preview.php itself.
Product is no longer actively supported and the vulnerabilities have not been fixed. Only version 2.2.4 was tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.
AnalysisAI
Reflected XSS in ATutor 2.2.4's preview.php enables an authenticated attacker to inject arbitrary JavaScript into a victim's browser session by manipulating the popup URL parameter. The frameset rendered by preview.php does not sanitize the popup parameter, allowing an attacker to break out of the HTML attribute context and append an event handler such as onload, even though the child frame file preview_top.php does apply sanitization. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid ATutor account (authenticated, PR:L per CVSS 4.0 vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 4.8 (Medium) accurately reflects the constrained real-world impact: exploitation requires the attacker to already hold a valid ATutor account (PR:L) and to socially engineer a logged-in victim into clicking a crafted link (UI:A). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch exists and none is planned, as ATutor is end-of-life. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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