Missing Authorization in OpenCATS SMTP Relay Feature
CVE-2026-112784

5.3MEDIUM

Key Information:

Vendor

Opencats

Status
Opencats
Vendor
CVE Published:
20 October 2026

What is CVE-2026-112784?

OpenCATS prior to version 0.10.0 is vulnerable to a missing authorization flaw in the ajax/testEmailSettings.php component. This vulnerability permits any authenticated user to send emails via the configured SMTP relay, allowing users with read-level access to exploit the testEmailAddress and fromAddress parameters. This could facilitate email spoofing, enabling the sender to manipulate the From address in outgoing communication, potentially leading to phishing attacks or unauthorized data exposure.

Affected Version(s)

OpenCATS 0 < 0.10.0

References

https://github.com/opencats/OpenCATS/issues/720
issue-tracking
https://github.com/opencats/OpenCATS/commit/aa3b414c3672f...
patch
https://github.com/opencats/OpenCATS/releases/tag/v0.10.0
release-notes

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

lighthousekeeper1212
leediay153 from Viettel Post
.