Vulnerability · Published May 7, 2026 · Assigned by GitHub_M

CVE-2026-41904FreeScout Stored XSS vulnerability in mailbox auto-reply: payload reaches every customer's email client (no CSP), bypassing strip_tags validator with mixed text+HTML content

High 7.6

In plain English

A high-severity cross-site scripting in freescout from freescout-help-desk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 3.1)7.6High

Exploit odds (30 days)0.2%top 93.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.217, a user with updateAutoReply permission can store an XSS payload in the mailbox auto-reply message. The payload is rendered unescaped in the auto-reply email sent to every customer who contacts the mailbox. Email clients do not enforce CSP, so the payload executes in the customer's webmail / mail-client context. This issue has been patched in version 1.8.217.

Affected products (as reported)

Vendor	Product	Versions
freescout-help-desk	freescout	< 1.8.217

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

References

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-q3fh-rj9h-jfrc x_refsource_CONFIRM
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.217 x_refsource_MISC