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CVE-2026-40497
No affected components available
FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, FreeScout's Helper::stripDangerousTags() removes <script>, <form>, <iframe>, <object> but does NOT strip <style> tags. The mailbox signature field is saved via POST /mailbox/settings/{id} and later rendered unescaped via {!! $conversation->getSignatureProcessed([], true) !!} in conversation views. CSP allows style-src * 'self' 'unsafe-inline', so injected inline styles execute freely. An attacker with access to mailbox settings (admin or agent with mailbox permission) can inject CSS attribute selectors to exfiltrate the CSRF token of any agent/admin who views a conversation in that mailbox. With the CSRF token, the attacker can perform any state-changing action as the victim (create admin accounts, change email/password, etc.) — privilege escalation from agent to admin. This is the result of an incomplete fix of GHSA-jqjf-f566-485j. That advisory reported XSS via mailbox signature. The fix applied Helper::stripDangerousTags() to the signature before saving. However, stripDangerousTags() only removes script, form, iframe, and object tags — it does NOT strip <style> tags, leaving CSS injection possible. Version 1.8.213 contains an updated fix.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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