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Freescout CVE-2024-34697

MEDIUM
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (CWE-74)
2024-05-14 security-advisories@github.com
6.1
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Input neutralization, injection prevention
Impact

CVSS score of 6.1 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required. Public proof-of-concept exploit code is available.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.6% exploitation probability (EPSS)

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AnalysisAI

FreeScout is a free, self-hosted help desk and shared mailbox. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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Technical ContextAI · show details

This vulnerability is classified under CWE-74. FreeScout is a free, self-hosted help desk and shared mailbox. A stored HTML Injection vulnerability has been identified in the Email Receival Module of the Freescout Application. The vulnerability allows attackers to inject malicious HTML content into emails sent to the application's mailbox. This vulnerability arises from improper handling of HTML content within incoming emails, allowing attackers to embed malicious HTML code in the context of the application's domain. Unauthenticated attackers can exploit this vulnerability to inject malicious HTML content into emails. This could lead to various attacks such as form hijacking, application defacement, or data exfiltration via CSS injection. Although unauthenticated attackers are limited to HTML injection, the consequences can still be severe. Version 1.8.139 implements strict input validation and sanitization mechanisms to ensure that any HTML content received via emails is properly sanitized to prevent malicious HTML injections. Affected products include: Freescout. Version information: Version 1.8.139.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 6.1 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionNVD

FreeScout is a free, self-hosted help desk and shared mailbox. A stored HTML Injection vulnerability has been identified in the Email Receival Module of the Freescout Application. The vulnerability allows attackers to inject malicious HTML content into emails sent to the application's mailbox. This vulnerability arises from improper handling of HTML content within incoming emails, allowing attackers to embed malicious HTML code in the context of the application's domain. Unauthenticated attackers can exploit this vulnerability to inject malicious HTML content into emails. This could lead to various attacks such as form hijacking, application defacement, or data exfiltration via CSS injection. Although unauthenticated attackers are limited to HTML injection, the consequences can still be severe. Version 1.8.139 implements strict input validation and sanitization mechanisms to ensure that any HTML content received via emails is properly sanitized to prevent malicious HTML injections.

Threat Intelligence Overview

EPSS Score
0.6%
Top 57% exploitable
Exploit
POC
Public exploit code exists
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC Yes
EPSS 0.6%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

51
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +30
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.

Affected Products (CPE)NVD

cpe:2.3:a:freescout:freescout:*:*:*:*:*:*:*:*
CVE-2026-28289 CRITICAL POC
10.0 Mar 03

File upload bypass in FreeScout 1.8.206 — patch bypass for CVE-2026-27636. PoC and patch available. CVSS 10.0.

CVE-2026-27636 HIGH POC
8.8 Feb 25

Remote code execution in FreeScout prior to version 1.8.206 allows authenticated users to upload `.htaccess` files that

CVE-2026-27637 CRITICAL POC
9.8 Feb 25

Predictable password reset tokens in FreeScout help desk before 1.8.206. Weak random number generation allows attackers

CVE-2026-53595 CRITICAL POC
9.4 Jul 20

Anonymous account takeover in FreeScout help desk before 1.8.224 lets an unauthenticated attacker seize the lowest-id ac

CVE-2024-29185 CRITICAL POC
9.0 Mar 22

FreeScout is a self-hosted help desk and shared mailbox. Rated critical severity (CVSS 9.0), this vulnerability is remot

CVE-2025-58163 HIGH POC
8.6 Sep 03

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Rated high severity (CVSS 8.6), this

CVE-2024-29184 HIGH POC
8.0 Mar 22

FreeScout is a self-hosted help desk and shared mailbox. Rated high severity (CVSS 8.0), this vulnerability is remotely

CVE-2024-28186 HIGH POC
7.1 Mar 12

FreeScout is an open source help desk and shared inbox built with PHP. Rated high severity (CVSS 7.1), this vulnerabilit

CVE-2024-34698 MEDIUM POC
6.3 May 14

FreeScout is a free, self-hosted help desk and shared mailbox. Rated medium severity (CVSS 6.3), this vulnerability is r

CVE-2026-32754 CRITICAL
9.3 Mar 19

A stored cross-site scripting (XSS) vulnerability exists in FreeScout help desk software versions 1.8.208 and below, whe

CVE-2026-41193 CRITICAL
9.1 Apr 21

Arbitrary file write in FreeScout (prior to 1.8.215) allows authenticated administrators to achieve remote code executio

CVE-2026-41902 CRITICAL
9.1 May 07

Unauthenticated account takeover in FreeScout versions prior to 1.8.217 allows remote attackers to gain permanent access

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