CVE-2026-40565CWE-79

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

Medium · published April 21, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
24.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00327 · 24.5th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-04-21T15:52Z
EPSS history
Timeline
  • 21 APR 15:52Z
    FreeScout has Stored XSS / CSS Injection via linkify() — Unescaped URL in Anchor href
    cvelistv5