CVE-2026-44260: efw4.X Readonly Flag Bypass Leads to File Modification
The National Vulnerability Database has detailed CVE-2026-44260, a high-severity vulnerability (CVSS 8.1) impacting efw4.X, an Enterprise Framework for Web. This flaw, present in versions prior to 4.08.010, allows attackers to bypass the intended readonly flag on the <efw:elFinder> JSP tag. While the flag is designed to prevent file modifications and controls client-side UI elements, the underlying event handlers fail to enforce this restriction for write operations.
Critically, an attacker can directly send requests to the server, completely circumventing the UI and its readonly state. This means that despite readonly=true being set, all file operations, including modifications and deletions, can be performed. The vulnerability is a clear example of insufficient access control enforcement at the server level, where client-side controls are mistakenly relied upon for security.
This is a classic authorization bypass. Defenders using efw4.X are vulnerable to unauthorized file manipulation if they haven’t patched. The fix is available in version 4.08.010. Organizations must prioritize this update to prevent potential data integrity issues or unauthorized code execution through file tampering.
What This Means For You
- If your organization uses efw4.X, you are exposed to unauthorized file modification. This vulnerability allows attackers to bypass UI restrictions and perform write operations directly. Patch to version 4.08.010 immediately to mitigate the risk.
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-2026-44260: elFinder Readonly Bypass File Operation
title: CVE-2026-44260: elFinder Readonly Bypass File Operation
id: scw-2026-05-12-ai-1
status: experimental
level: high
description: |
Detects attempts to bypass the readonly flag in elFinder versions prior to 4.08.010 by directly sending file operation commands (upload, paste, copy, cut, delete, mkfile, mkdir) to the elfinder connector endpoint. This bypasses client-side UI restrictions and allows unauthorized file modifications.
author: SCW Feed Engine (AI-generated)
date: 2026-05-12
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-44260/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri:
- '/elfinder/connector'
cs-method:
- 'POST'
cs-uri-query|contains:
- 'cmd=upload'
- 'cmd=paste'
- 'cmd=copy'
- 'cmd=cut'
- 'cmd=delete'
- 'cmd=mkfile'
- 'cmd=mkdir'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-44260 | Auth Bypass | efw4.X < 4.08.010 |
| CVE-2026-44260 | Auth Bypass | Vulnerable component: |
| CVE-2026-44260 | Auth Bypass | Vulnerable mechanism: readonly flag not enforced server-side for write operations |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 13, 2026 at 01:16 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.
Believe this infringes your rights? Submit a takedown request.
Related coverage
Fuji Tellus Driver Grants All Users Kernel R/W: CVE-2026-8108
CVE-2026-8108 — The installation of Fuji Tellus adds a driver to the kernel which grants all users read and write permissions.
MonsterInsights WordPress Plugin Exposes Google OAuth Tokens
CVE-2026-5371 — The MonsterInsights – Google Analytics Dashboard for WordPress (Website Stats Made Easy) plugin for WordPress is vulnerable to unauthorized access and modification of...
ChurchCRM CVE-2026-44548: High-Severity CSRF Allows Silent Record Deletion
CVE-2026-44548 — ChurchCRM is an open-source church management system. Prior to 7.3.2, top-level cross-site GET navigation from an attacker-controlled page to FundRaiserDelete.php, PropertyTypeDelete.php, or NoteDelete.php...