CVE-2026-27636Public exploitNetwork attack vector

Authenticated code execution via unrestricted configuration-file upload

Published Feb 25, 2026 · Updated Feb 25, 2026

Unrestricted file upload in FreeScout before 1.8.206 allows remote authenticated users to execute code on Apache servers. The restricted_extensions list in app/Misc/Helper.php accepts .htaccess and .user.ini attachments, allowing Apache or PHP to treat uploaded files as configuration. Any authenticated role with attachment access can reach the flaw when Apache AllowOverride All is enabled, resulting in arbitrary command execution and file access as the web-service account.

CVSS severity8.8
High
EPSS probability2.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in FreeScout before 1.8.206 allows remote authenticated users to execute code on Apache servers. The restricted_extensions list in app/Misc/Helper.php accepts .htaccess and .user.ini attachments, allowing Apache or PHP to treat uploaded files as configuration. Any authenticated role with attachment access can reach the flaw when Apache AllowOverride All is enabled, resulting in arbitrary command execution and file access as the web-service account.

The record

CVE
CVE-2026-27636
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
FreeScout
Product
FreeScout
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.206

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FreeScout · FreeScoutversion=< 1.8.206

Published CVSS scores

8.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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