CVE-2026-5015: elecV2P XSS Vulnerability in Logs Endpoint

CVE-2026-5015 Overview

CVE-2026-5015 is a cross-site scripting (XSS) vulnerability affecting elecV2 elecV2P versions up to and including 3.8.3. The flaw resides in an unknown function within the /logs file of the Endpoint component. Attackers can manipulate the filename argument to inject malicious script content that executes in the context of a victim's browser session. The vulnerability is exploitable remotely and requires user interaction. The exploit has been publicly disclosed, increasing the likelihood of opportunistic abuse. The project maintainers were notified through an issue report but have not responded at the time of disclosure.

Critical Impact
Remote attackers can inject arbitrary JavaScript through the filename parameter, leading to session manipulation, credential theft, or unauthorized actions performed in the victim's browser context.

Affected Products

elecV2 elecV2P versions up to 3.8.3
elecV2P Endpoint component (/logs handler)
All deployments exposing the elecV2P web interface to untrusted users

Discovery Timeline

2026-03-28 - CVE-2026-5015 published to NVD
2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-5015

Vulnerability Analysis

The vulnerability is classified under [CWE-79] Improper Neutralization of Input During Web Page Generation. The defect resides in the /logs endpoint of the Endpoint component within elecV2P. When the application processes the filename argument, it fails to sanitize or encode user-supplied content before reflecting it into the rendered response.

An attacker can craft a request containing JavaScript payloads in the filename parameter. When a victim views the affected page, the browser interprets the injected content as executable script. This grants the attacker the ability to operate within the user's authenticated session.

The attack vector is network-based with low complexity, and user interaction is required for exploitation. The scope of impact is limited to integrity of the rendered output, with no direct effect on confidentiality or availability of the underlying system.

Root Cause

The root cause is missing output encoding and input validation on the filename parameter handled by the /logs route. User-controlled input flows into the HTTP response without contextual escaping, allowing browser-side interpretation of injected markup or scripts.

Attack Vector

Exploitation typically follows a reflected XSS pattern. An attacker constructs a URL pointing to the elecV2P /logs endpoint with a malicious filename value. The attacker then delivers the URL through phishing, chat, or a malicious referrer. When an authenticated user opens the link, the injected payload executes against the elecV2P origin. The vulnerability description in the NVD entry confirms remote exploitability and public disclosure of the exploit technique.

Detection Methods for CVE-2026-5015

Indicators of Compromise

HTTP requests to /logs containing script-like characters in the filename parameter such as <script>, onerror=, javascript:, or HTML entities used for evasion
Web server access logs showing unusual long or URL-encoded values for the filename query string
Outbound browser requests from elecV2P users to attacker-controlled domains following access to /logs

Detection Strategies

Inspect web application firewall (WAF) and reverse proxy logs for reflected XSS signatures targeting the /logs route
Deploy content-based detection rules that match script payload patterns within query parameters destined for elecV2P
Correlate user agent strings, referrers, and authentication events to identify suspicious access to the Endpoint component

Monitoring Recommendations

Enable verbose HTTP request logging on the elecV2P host and forward logs to a centralized analytics platform
Alert on requests where the filename argument contains angle brackets, JavaScript event handlers, or encoded variants
Track anomalous DOM activity in browsers used by administrators of elecV2P, including unexpected fetches to external hosts

How to Mitigate CVE-2026-5015

Immediate Actions Required

Restrict network access to the elecV2P management interface using firewall rules or VPN gating until a fix is released
Require administrators to avoid clicking untrusted links that reference the elecV2P host
Apply a reverse proxy or WAF rule that filters or rejects script-like content in the filename parameter on /logs

Patch Information

No vendor patch is available at the time of publication. The project maintainers were informed through a GitHub issue report but have not responded. Monitor the GitHub Project Repository and the associated GitHub Issue Discussion for remediation updates. Additional vulnerability metadata is available through the VulDB Vulnerability #353900 entry.

Workarounds

Place elecV2P behind an authenticating reverse proxy that strips or encodes HTML metacharacters in query parameters
Enforce a strict Content Security Policy (CSP) header on the elecV2P response, disallowing inline scripts and untrusted origins
Limit elecV2P administrator sessions to dedicated browser profiles to reduce the impact of session hijacking

bash

# Example NGINX reverse proxy rule to block script-like filename parameters
location /logs {
    if ($arg_filename ~* "(<|>|script|javascript:|onerror=|onload=)") {
        return 403;
    }
    proxy_pass http://elecv2p_backend;
}