Is PHP affected by CVE-2026-4973?

Organizations using A vulnerability should be aware of moderate risk from CVE-2026-4973, a cross-site scripting vulnerability rated CVSS 5.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users.

CVE-2026-4973

EUVD-2026-16807 MEDIUM

2026-03-27 [email protected]

5.1

CVSS 4.0

CVSS: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/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Mar 27, 2026 - 20:22 vuln.today

EUVD ID Assigned

Mar 27, 2026 - 20:22 euvd

EUVD-2026-16807

CVE Published

Mar 27, 2026 - 20:16 nvd

MEDIUM 5.1

Description

A vulnerability was detected in SourceCodester Online Quiz System hasta 1.0. Affected by this vulnerability is an unknown functionality of the file endpoint/add-question.php. Performing a manipulation of the argument quiz_question results in cross site scripting. It is possible to initiate the attack remotely. The exploit is now public and may be used.

Analysis

Stored cross-site scripting (XSS) in SourceCodester Online Quiz System up to version 1.0 allows authenticated remote attackers to inject malicious scripts via the quiz_question parameter in endpoint/add-question.php, affecting users who view the injected quiz content. The vulnerability has CVSS 5.1 (low-to-moderate severity), requires user interaction to trigger, and public exploit code is available. …

Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +26

POC: 0

CVE-2026-4973 vulnerability details – vuln.today

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CVE-2026-4973

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CVE-2026-4973

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External POC / Exploit Code