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Vulnerability record · CVE-2026-40565 · published 21 April 2026

CVE-2026-40565: Freescout cross-site scripting vulnerability

Freescout · Freescout

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.

6.1 CVSS 3.1 Medium EPSS 0.33% · top 76.8% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/freescout-help-desk/freescout/commit/265379b3ae343f06846adc0aa8510643d1eac2df Patch
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213 Release Notes
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-49pm-xwqj-vwjp Vendor Advisory
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-49pm-xwqj-vwjp Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-40565), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.