CVE-2026-85743
FreeScout: Server-side request forgery via incomplete outbound host validation and unguarded download sinks
FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.230, multiple outbound paths in Helper::downloadRemoteFile(), Helper::checkPort(), Helper::sanitizeRemoteUrl(), MailboxesController.php, and ModulesController.php do not consistently enforce a sink-level restricted-host policy. An authenticated administrator, or another authenticated user permitted to change mailbox connection settings or trigger module update or installation paths, can supply attacker-controlled URLs or hosts. The independent download and port-test sinks can reach encoded or otherwise uncovered loopback and internal addresses. The redirect-validation bypass additionally requires a configured whitelist that permits the original and final hosts while a restricted internal host appears only as an intermediate redirect hop. No unauthenticated SSRF path is established. The server can consequently contact loopback and internal services, provide a blind internal port oracle, and retrieve internal HTTP responses into application-controlled download sinks. This issue is fixed in version 1.8.230.
Fixes and workarounds
Fix
freescout-help-desk/freescout (composer): GitHub reports patched versions 1.8.230. Check the advisory for the affected release branch.
Source: GitHub GHSA-6w8v-qp43-vg2hAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| freescout freescout-help-desk |
< 1.8.230 (affected) | CNA: GitHub_M |
freescout-help-desk/freescoutfreescout-help-desk/freescout
composer |
<1.8.230 (affected, GitHub advisory range) | GitHub GHSA-6w8v-qp43-vg2h |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 8.2 high |
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:L | CNA: GitHub_M |
| 3.1 / 8.2 high |
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:L | NVD: [email protected] |
Exploit evidence
- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6w8v-qp43-vg2h
exploit · ADP: CISA-ADP
References
- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6w8v-qp43-vg2hCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/freescout-help-desk/freescout/commit/09799fd4bcf731704bc2099a87bca0cf18d20acbCNA: GitHub_M · x_refsource_MISC
- https://github.com/freescout-help-desk/freescout/commit/a4c587cf1fff87eae7d3e4f297fa4cc81ba28704CNA: GitHub_M · x_refsource_MISC
- https://github.com/freescout-help-desk/freescout/releases/tag/1.8.230CNA: GitHub_M · x_refsource_MISC
- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6w8v-qp43-vg2hADP: CISA-ADP · exploit
- https://github.com/freescout-help-desk/freescout/commit/09799fd4bcf731704bc2099a87bca0cf18d20acb[email protected]
- https://github.com/freescout-help-desk/freescout/commit/a4c587cf1fff87eae7d3e4f297fa4cc81ba28704[email protected]
- https://github.com/freescout-help-desk/freescout/releases/tag/1.8.230[email protected]
- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6w8v-qp43-vg2h[email protected]
- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6w8v-qp43-vg2hGitHub Security Advisories · advisory
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