CVE-2026-40565

MEDIUM

FreeScout has Stored XSS / CSS Injection via linkify() — Unescaped URL in Anchor href

Title source: cna
STIX 2.1

Description

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.

References (3)

Core 3

Scores

CVSS v3 6.1
EPSS 0.0020
EPSS Percentile 9.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
freescout/freescout < 1.8.213
freescout-help-desk/freescout < 1.8.213
Published Apr 21, 2026
Tracked Since Apr 21, 2026