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CVE-2026-27636 affects FreeScout, a PHP Laravel-based help desk and shared inbox application, in versions prior to 1.8.206. The vulnerability is caused by an incomplete file upload restriction list in app/Misc/Helper.php that fails to block dangerous server-configuration files such as .htaccess and .user.ini. As a result, an authenticated user with file upload capability can upload a malicious .htaccess file. On Apache deployments where AllowOverride All is enabled, the uploaded .htaccess can redefine how files in the target directory are handled, for example by causing otherwise non-executable files to be interpreted as PHP. This enables remote code execution on the FreeScout server. The issue can be exploited independently or chained with CVE-2026-27637. FreeScout fixed the vulnerability in version 1.8.206.
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AllowOverride All, especially in user-writable or upload-accessible directories. Prevent execution or processing of uploaded files as PHP, and explicitly block uploads of .htaccess and .user.ini files in all upload paths. Restrict upload permissions to only necessary roles, monitor for suspicious uploads of dotfiles or server-configuration files, and review web-accessible attachment/storage directories for unauthorized files. These measures reduce exposure but do not replace vendor patching.Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authenticated remote code execution (RCE) vulnerability in FreeScout that allows any logged-in user to execute arbitrary commands on the server (via file upload/attachment handling leading to server-side code execution).
An authenticated remote code execution vulnerability in FreeScout that was patched, but the fix was incomplete and could be bypassed, enabling escalation into an unauthenticated zero-click RCE chain (CVE-2026-28289).
A FreeScout remote code execution vulnerability exploitable by authenticated users with file upload permissions; CVE-2026-28289 bypasses the attempted fix for this issue to re-enable exploitation.
An earlier FreeScout vulnerability referenced as the issue being bypassed; the content indicates CVE-2026-28289 bypasses the patch for this CVE, enabling RCE via file upload tricks.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.