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CVE-2026-85744— FreeScout: Conversation Merge Cross-Mailbox Authorization Bypass

Quick assessment

Affected
freescout-help-desk freescout
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeScout 是一款自托管的工单系统与共享邮箱平台。在版本 1.8.227 之前， 操作会在 中记录针对目标会话的授权检查失败信息，随后在源会话循环中将该值清除。这导致已认证的客服代理能够将其可控的会话合并至其无权访问的邮箱中的目标会话。该操作会将线程、附件及审计记录注入到未经授权的目标会话中，并删除源会话，但不会泄露目标会话的现有内容。此问题已在版本 1.8.227 中修复。

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-85744

Vulnerability Information
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Vulnerability Title
FreeScout: Conversation Merge Cross-Mailbox Authorization Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.227, the conversation_merge action records a failed authorization check for the target conversation in response['msg'] and then clears that value inside the source-conversation loop. An authenticated agent can merge a conversation they control into a target conversation in a mailbox they cannot access. The operation injects threads, attachments, and audit records into the unauthorized target and deletes the source conversation, but it does not disclose the target's existing contents. This issue is fixed in version 1.8.227.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
freescout-help-desk freescout < 1.8.227 -

II. Public POCs for CVE-2026-85744

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III. Intelligence Information for CVE-2026-85744

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Other References for CVE-2026-85744 (3)

Same Patch Batch · freescout-help-desk · 2026-11-06 · 11 CVEs total

CVE-2026-85743 8.2 HIGH FreeScout: Server-side request forgery via incomplete outbound host validation and unguard
CVE-2026-62856 7.7 HIGH FreeScout: Cross-User Notification Data Disclosure via LIKE Wildcard Injection in Polycast
CVE-2026-62854 7.6 HIGH FreeScout: Stored XSS in mailbox signature via same-origin JS upload
CVE-2026-85742 7.5 HIGH FreeScout: Conditional stored admin XSS via failed-job details
CVE-2026-103985 7.1 HIGH FreeScout: a restricted agent can lift their own admin-imposed "see only assigned conversa
CVE-2026-103984 6.5 MEDIUM FreeScout: Incomplete fix for CVE-2026-40570: load_customer_info exposes cross-visibility
CVE-2026-62852 6.5 MEDIUM FreeScout: Missing Authorization and Exposure of Sensitive Information to an Unauthorized
CVE-2026-62850 5.3 MEDIUM FreeScout: Administrative tools.php endpoint is accessible to low-privileged users, enabli
CVE-2026-62855 4.4 MEDIUM FreeScout: Path Traversal in App Logs Viewer Exposes Arbitrary Local Files
CVE-2026-62851 4.3 MEDIUM FreeScout: Cross-mailbox conversation existence / internal-id disclosure via the search-by

IV. Related Vulnerabilities

Same product: freescout
Same vendor: freescout-help-desk
Same weakness: CWE-863