EUVD-2026-46083Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V5 - File Handling File type validation, storage isolation
MITRE ATT&CK
2 techniques across 2 tactics: Command and Control, Persistence The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAIv1 – Jul 20, 2026
Authenticated remote code execution in FreeScout help desk prior to version 1.8.224 allows any logged-in agent to upload a malicious .pht file that executes as PHP on the default Apache plus libapache2-mod-php stack, yielding arbitrary command execution as the www-data user. The flaw is a denylist bypass: the restricted-extension filter added by the earlier CVE-2025-48471 fix blocked phtml and phar but missed .pht (as well as .phtm and .phps), which Apache's default FilesMatch handler still runs as PHP. No public exploit or CISA KEV listing is identified at time of analysis, but the technique is well understood and low-complexity given a valid agent account.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Know when Freescout gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (GitHub_M) · only source for this CVE.
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
2DescriptionCVE.org
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.224, the denylist that neutralizes dangerous file uploads (Helper::$restricted_extensions) is incomplete: it does not cover the .pht extension. The authenticated upload endpoint POST /uploads/upload (SecureController@upload) stores files with their original extension into the web-accessible directory storage/app/public/uploads/ (served at /storage/uploads/). On the standard Apache + libapache2-mod-php deployment, the default handler <FilesMatch ".+\.ph(ar|p[3457]?|t|tml)$"> executes .pht, so any authenticated agent can upload a .pht web shell and run arbitrary commands as the web-server user (www-data). This is a direct bypass of the fix for CVE-2025-48471, which added phtml/phar but not pht (nor phtm, phps). Version 1.8.224 contains an updated fix.
Articles & Coverage 2
Executive ViewAI
FreeScout help desk software versions prior to 1.8.224 allow authenticated support agents to upload malicious files that execute arbitrary server commands, exposing customer data and creating a pivot point for attackers to breach connected internal systems. The vulnerability stems from an incomplete file-type filter that missed .pht, .phtm, and .phps extensions recognized by Apache's default handler.
Within 24 hours: inventory all FreeScout deployments, confirm versions below 1.8.224, disable file upload functionality in affected systems, and audit access logs for suspicious file uploads from agent accounts. Within 7 days: implement file-type detection and alerting rules for .pht/.phtm/.phps uploads, restrict file upload permissions to a minimal trusted set of agents, and test your upgrade procedure on a non-production instance. Within 30 days: upgrade all affected FreeScout instances to version 1.8.224 or later, validate file upload restrictions post-upgrade, and perform security testing to confirm the filter now properly blocks all executable extensions.
Apply vendor patch: upgrade to FreeScout 1.8.224 or later. Interim mitigations: restrict file upload permissions to essential administrators only, implement Web Application Firewall rules blocking .pht/.phtm/.phps uploads, maintain detailed audit logs of all file uploads, monitor for failed authentication attempts on agent accounts, and consider disabling file uploads entirely until patched if uploads are infrequently used.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Malicious file upload attacks exploit insufficient validation when web applications accept user-provided files.
File upload bypass in FreeScout 1.8.206 — patch bypass for CVE-2026-27636. PoC and patch available. CVSS 10.0.
Remote code execution in FreeScout prior to version 1.8.206 allows authenticated users to upload `.htaccess` files that
Predictable password reset tokens in FreeScout help desk before 1.8.206. Weak random number generation allows attackers
Anonymous account takeover in FreeScout help desk before 1.8.224 lets an unauthenticated attacker seize the lowest-id ac
FreeScout is a self-hosted help desk and shared mailbox. Rated critical severity (CVSS 9.0), this vulnerability is remot
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Rated high severity (CVSS 8.6), this
FreeScout is a self-hosted help desk and shared mailbox. Rated high severity (CVSS 8.0), this vulnerability is remotely
FreeScout is an open source help desk and shared inbox built with PHP. Rated high severity (CVSS 7.1), this vulnerabilit
FreeScout is a free, self-hosted help desk and shared mailbox. Rated medium severity (CVSS 6.3), this vulnerability is r
FreeScout is a free, self-hosted help desk and shared mailbox. Rated medium severity (CVSS 6.1), this vulnerability is r
A stored cross-site scripting (XSS) vulnerability exists in FreeScout help desk software versions 1.8.208 and below, whe
Arbitrary file write in FreeScout (prior to 1.8.215) allows authenticated administrators to achieve remote code executio
Exploit-DB