FreeScout CVE-2026-40565

EUVD-2026-24141 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-04-21 GitHub_M

PHP XSS

6.1

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch available

Apr 21, 2026 - 17:01 EUVD

Analysis Generated

Apr 21, 2026 - 16:32 vuln.today

DescriptionNVD

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.

AnalysisAI

Stored cross-site scripting (XSS) in FreeScout prior to version 1.8.213 allows remote attackers to inject arbitrary HTML attributes into email message bodies by embedding unescaped double-quote characters in URLs. When the linkify() function converts plain-text URLs to anchor tags without proper escaping, attackers can break out of the href attribute and inject malicious JavaScript or event handlers. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-40565 vulnerability details – vuln.today

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