Know every vulnerabilitybefore it knows you.
DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.
CVE-2026-40568
No affected components available
FreeScout is a free self-hosted help desk and shared mailbox. Versions prior to 1.8.213 have a stored cross-site scripting (XSS) vulnerability in the mailbox signature feature. The sanitization function Helper::stripDangerousTags() (app/Misc/Helper.php:568) uses an incomplete blocklist of only four HTML tags (script, form, iframe, object) and does not remove event handler attributes. When a mailbox signature is saved via MailboxesController::updateSave() (app/Http/Controllers/MailboxesController.php:267), HTML elements such as <img>, <svg>, and <details> with event handler attributes like onerror and onload pass through sanitization unchanged and are stored in the database. The signature is then rendered as raw HTML via the Blade {!! !!} tag in editor_bottom_toolbar.blade.php:6 and re-inserted into the visible DOM by jQuery .html() at main.js:1789-1790, triggering the injected event handlers. Any authenticated user with the ACCESS_PERM_SIGNATURE (sig) permission on a mailbox -- a delegatable, non-admin permission -- can inject arbitrary HTML and JavaScript into the mailbox signature. The payload fires automatically, with no victim interaction, whenever any agent or administrator opens any conversation in the affected mailbox. This enables session hijacking (under CSP bypass conditions such as IE11 or module-weakened CSP), phishing overlays that work in all browsers regardless of CSP, and chaining to admin-level actions including email exfiltration via mass assignment and self-propagating worm behavior across all mailboxes. Version 1.8.213 fixes the issue.
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 basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. 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 low 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.
Browse More
Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.
Checkout DevGuard