What is CVE-2026-112784?

CVE-2026-112784 is a medium-severity vulnerability in Opencats, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-20.

How severe is CVE-2026-112784?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Opencats

CVE-2026-112784

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.

Vulnerability class: Broken Access Control

Published 2026-10-20 · last modified 2026-10-20.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Opencats

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

github.com/opencats/OpenCATS/issues/720 (issue-tracking)
github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bd (patch)
github.com/opencats/OpenCATS/releases/tag/v0.10.0 (release-notes)
github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/ajax… (technical-description)
www.vulncheck.com/advisories/opencats-before-0.10.0-missing-authorization-via-a… (third-party-advisory)

Frequently asked questions

What is CVE-2026-112784?: CVE-2026-112784 is a medium-severity vulnerability in Opencats, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-20.
How severe is CVE-2026-112784?: Medium severity. CVSS v3 base score is 4.3 out of 10.