Medium severity · published Oct 20, 2026
CVE-2026-112784
OpenCATS before 0.10.0 Missing Authorization via ajax/testEmailSettings.php
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenCATS · opencats
before 0.10.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-112784
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-112784
github.com
https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/ajax/testEmailSettings.php
github.com
https://github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bd
github.com
https://github.com/opencats/OpenCATS/issues/720
github.com
https://github.com/opencats/OpenCATS/releases/tag/v0.10.0
www.vulncheck.com
https://www.vulncheck.com/advisories/opencats-before-0.10.0-missing-authorization-via-ajax-testemailsettings-php
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