What’s Vulnerable › Vulnerabilities

CVE-2026-112784: OpenCATS before 0.10.0 Missing Authorization via ajax/testEmailSettings.php

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-20
• Weakness: CWE-862

Description

OpenCATS before 0.10.0 contains a missing authorization vulnerability in ajax/testEmailSettings.php that allows any authenticated user to send mail through the configured SMTP relay. Read-level users can supply testEmailAddress and fromAddress parameters to send the fixed test message to any recipient with a spoofed From address.

Affected products

• OpenCATS: before 0.10.0 — fixed in 0.10.0

How to fix

Upgrade to a fixed version: OpenCATS 0.10.0. Check the vendor advisory for mitigations.

References

• https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/ajax/testEmailSettings.php
• https://github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bd
• https://github.com/opencats/OpenCATS/issues/720
• https://github.com/opencats/OpenCATS/releases/tag/v0.10.0
• https://www.vulncheck.com/advisories/opencats-before-0.10.0-missing-authorization-via-ajax-testemailsettings-php

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