CVE-2026-40589 | freescout-help-desk freescout up to 1.8.213 Email Address authorization (GHSA-mv55-3mgv-fxwr)

VDB-358536 · CVE-2026-40589 · GHSA-MV55-3MGV-FXWR FREESCOUT-HELP-DESK FREESCOUT UP TO 1.8.213 EMAIL ADDRESS AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.8 $0-$5k 2.61+ Summaryinfo A vulnerability labeled as critical has been found in freescout-help-desk freescout up to 1.8.213. This affects an unknown part of the component Email Address Handler. The manipulation results in authorization. This vulnerability is identified as CVE-2026-40589. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded. Detailsinfo A vulnerability, which was classified as critical, was found in freescout-help-desk freescout up to 1.8.213. Affected is an unknown part of the component Email Address Handler. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes: FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, a low-privileged agent can edit a visible customer and add an email address already owned by a hidden customer in another mailbox. The server discloses the hidden customer’s name and profile URL in the success flash, reassigns the hidden email to the visible customer, and rebinds hidden-mailbox conversations for that email to the visible customer. Version 1.8.214 fixes the issue. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-40589 since 04/14/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are neither technical details nor an exploit publicly available. Upgrading to version 1.8.214 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 2e2fe37111d92ac665b9ad8806eac94a1a3e502c is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Vendor freescout-help-desk Name freescout Version 1.8.213 License open-source Website Product: https://github.com/freescout-help-desk/freescout/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.9 VulDB Meta Temp Score: 6.8 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.6 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authorization CWE: CWE-639 / CWE-285 / CWE-266 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: freescout 1.8.214 Patch: 2e2fe37111d92ac665b9ad8806eac94a1a3e502c Timelineinfo 04/14/2026 CVE reserved 04/21/2026 +7 days Advisory disclosed 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-mv55-3mgv-fxwr Status: Confirmed CVE: CVE-2026-40589 (🔒) GCVE (CVE): GCVE-0-2026-40589 GCVE (VulDB): GCVE-100-358536 Entryinfo Created: 04/21/2026 19:44 Changes: 04/21/2026 19:44 (67) Complete: 🔍 Cache ID: 99:210:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸