CVE-2026-41936: Vvveb XXE Allows File Disclosure, Privilege Escalation
The National Vulnerability Database has disclosed CVE-2026-41936, an XML External Entity (XXE) injection vulnerability in Vvveb versions prior to 1.0.8.2. This flaw, rated 8.1 (HIGH), exists within the admin Tools/Import feature and specifically targets authenticated site_admin users.
Attackers can leverage this vulnerability by exploiting the XML parser configuration in system/import/xml.php. By injecting file:// or php://filter entity references, they can force the application to resolve these and persist them into the database. This enables arbitrary file disclosure, allowing attackers to read sensitive system files. Critically, this can also be abused to overwrite administrator password hashes, leading directly to privilege escalation.
This isn’t just about reading files; it’s a direct path to full administrative control. The attacker’s calculus here is simple: gain a foothold as a site_admin (which might be achievable through other means, or even a low-privilege account that gets escalated), then exploit this XXE to take over the entire application. The persistence into the database makes this particularly nasty, as the malicious configuration could remain active even after initial exploitation.
What This Means For You
- If your organization uses Vvveb, immediately check your version. Patch to 1.0.8.2 or later without delay. Review logs for any unusual activity related to the `Tools/Import` feature, particularly XML imports. Assume any `site_admin` account could be compromised if you haven't patched, and audit those accounts rigorously.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-41936: Vvveb XXE File Disclosure via XML Import
title: CVE-2026-41936: Vvveb XXE File Disclosure via XML Import
id: scw-2026-05-06-ai-1
status: experimental
level: critical
description: |
Detects the exploitation of CVE-2026-41936 in Vvveb by identifying POST requests to '/system/import/xml.php' containing 'file://' in the URI query, indicative of an XXE attack attempting to read arbitrary files.
author: SCW Feed Engine (AI-generated)
date: 2026-05-06
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-41936/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
uri|contains:
- '/system/import/xml.php'
cs-method:
- 'POST'
cs-uri-query|contains:
- 'file://'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-41936 | XXE | Vvveb < 1.0.8.2 |
| CVE-2026-41936 | XXE | admin Tools/Import feature |
| CVE-2026-41936 | XXE | system/import/xml.php |
| CVE-2026-41936 | Information Disclosure | Arbitrary file disclosure via file:// or php://filter |
| CVE-2026-41936 | Privilege Escalation | Administrator password hash overwriting |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 06, 2026 at 22:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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