PT-2026-33996 · Freescout Help Desk · Freescout

Published 2026-04-21 · Updated 2026-04-21 · CVE-2026-40565

Mitre

CVSS v3.1

6.1

Medium

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, FreeScout's linkify() function in app/Misc/Helper.php converts plain-text URLs in email bodies into HTML anchor tags without escaping double-quote characters (") in the URL. HTMLPurifier (called first via getCleanBody()) preserves literal " characters in text nodes. linkify() then wraps URLs including those " chars inside an unescaped href="..." attribute, breaking out of the href and injecting arbitrary HTML attributes. Version 1.8.213 fixes the issue.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-40565

Affected Products

Freescout

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-40565 · Security Note
• https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213 · Note
• https://github.com/freescout-help-desk/freescout/commit/265379b3ae343f06846adc0aa8510643d1eac2df · Note
• https://twitter.com/CVEnew/status/2046636259632660973 · Twitter Post
• https://twitter.com/infoflowcloud/status/2046637677353582839 · Twitter Post
• https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-49pm-xwqj-vwjp · Note