What’s Vulnerable › Vulnerabilities

CVE-2026-41904: FreeScout 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

• Severity: high (CVSS 7.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-07 · updated 2026-06-17
• Weakness: CWE-79

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

• freescout-help-desk freescout: before 1.8.217

References

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

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