CVE DatabaseCVE-2026-78192

Updated 2026-11-06한국어 권고문 →

CVE-2026-781927.5/HIGHCWE-540CWE-1188

WebDyne Perl Framework Source Code & Credentials Disclosure Vulnerability (CVE-2026-78192) Analysis and Mitigation Guide

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Affected Vendors

aspeer, perl

Affected Components

webdyne

Published Date

2026-10-31

CVSS v3.1

7.5

HIGH

EPSS (30d)

0.4%

FIRST.org

CISA KEV

Not Listed

NVD Source ↗

Executive & SecOps Summary

SECOPS ASSESSMENT

Affected Scope

WebDyne versions from 2.022 before 3.022 for Perl

Impact

Unauthenticated remote attackers can read application source code (.psp, .pm, .pl) and extract hardcoded credentials via the default index page viewer

Mitigation

Immediately upgrade WebDyne to version 3.022 or later

Affected Products & Version Scope

WebDyne versions 2.022 up to (but excluding) 3.022

Remediation & Live Workaround Commands

PATCH & WORKAROUND

1. Official Patch & Version Upgrade Commands

Upgrade the WebDyne framework to the patched version (3.022 or later) using CPAN.

bash

# Upgrade WebDyne via CPAN
perl -MCPAN -e 'install WebDyne'

# Alternatively, using cpanminus
cpanm --upgrade WebDyne

2. Temporary Workaround & Hardening Configuration

If an immediate upgrade is not feasible, disable the default index page in your wrapper script (e.g., webdyne.psgi) or block access to the source viewer via a reverse proxy like Nginx.

nginx

# Nginx configuration to block malicious source parameter requests
server {
    listen 80;
    server_name yourdomain.com;

    # Block requests attempting to read source files via query parameters
    if ($args ~* 'source=.*\.(psp|pm|pl)') {
        return 403;
    }

    location / {
        proxy_pass http://127.0.0.1:5000;
        proxy_set_header Host $host;
    }
}

3. Log Audit & IoC Verification Commands

Verify the currently installed WebDyne version and inspect access logs for potential exploitation attempts.

bash

# 1. Check the installed WebDyne version
perl -MWebDyne -e 'print $WebDyne::VERSION;'

# 2. Scan web server access logs for source disclosure attempts
grep -Ei 'source=.*\.(psp|pm|pl)' /var/log/nginx/access.log /var/log/httpd/access_log

Interactive SecOps Remediation Checklist

0/4 (0%)

Recommended Security Control & Mitigation Partner

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Upgrade WebDyne to version 3.022 or higher immediately and rotate any credentials that may have been exposed in the source files.

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Technical Root Cause & Exploitation Mechanics

1. Vulnerability Overview & Root Cause

This vulnerability (CVE-2026-78192) is a critical security flaw arising from insecure default configurations (CWE-1188) and sensitive information disclosure (CWE-540) in the WebDyne Perl web framework. By default, WebDyne's wrapper scripts, such as webdyne.psgi, enable a built-in index page. The source viewer component within this default index page fails to properly restrict file access, returning files under the document root based on the source parameter of an HTMX request.

2. Exploitation Mechanics & Attack Scenario

An unauthenticated remote attacker can exploit this vulnerability by sending a crafted HTMX request to the target application. By manipulating the source parameter to point to sensitive application files, the attacker can force the server to return the raw contents of .psp, .pm, and .pl files. This allows the attacker to view the raw Perl code, including the __PERL__ blocks of .psp pages, which often contain sensitive business logic and hardcoded credentials.

3. Infrastructure & Business Impact

Exposure of the application's source code compromises intellectual property and allows attackers to conduct offline white-box analysis to discover further vulnerabilities. Furthermore, the exposure of hardcoded credentials (such as database passwords or API keys) can lead to unauthorized database access, lateral movement within the infrastructure, and full system compromise.

Official Vendor Advisories & References

NVD Original English Description

WebDyne versions from 2.022 before 3.022 for Perl disclose application source to unauthenticated clients via the viewer in the default index page. WebDyne's wrapper scripts, such as webdyne.psgi, enable the built-in index page by default. Its source viewer returns files under the document root named in the source parameter of an HTMX request, including .psp, .pm and .pl files. A remote attacker can read the application's Perl code, including the __PERL__ blocks of .psp pages and any credentials they hold.

https://metacpan.org/release/ASPEER/WebDyne-3.022/changes

Source: 9b29abf9-4ab0-4765-b253-1875cd9b441e

Frequently Asked SecOps Questions (CVE-2026-78192)

FAQ

Q1. How critical is CVE-2026-78192 and is it actively exploited in the wild?

CVE-2026-78192 is rated CVSS 7.5 (HIGH) with a 30-day EPSS exploitation probability of 0.4%. Organizations running affected versions should prioritize patching based on network exposure.

Q2. Which vendors and products are affected by CVE-2026-78192?

Primary impacted vendors include aspeer, perl across webdyne. Scope summary: WebDyne versions 2.022 up to (but excluding) 3.022

Q3. What temporary mitigations or workarounds exist for CVE-2026-78192 before patching?

[Mitigation] Immediately upgrade WebDyne to version 3.022 or later Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.

SECOPS WORKBENCH INTEGRATION