Auth bypass in Ai Engine

CVE-2026-16953

The AI Engine WordPress plugin before 3.6.4 does not verify ownership of a guest's uploaded chatbot files before deletion, authorising the action solely by a client-supplied session cookie value, so an unauthenticated attacker who obtains a victim's session identifier and file reference can delete that victim's uploaded files.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (8.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-16953: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

  • Ai Engine — versions 0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-16953?
CVE-2026-16953 is a medium-severity vulnerability in Ai Engine, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.8/10. Published 2026-08-08.
How severe is CVE-2026-16953?
Medium severity. CVSS v3 base score is 4.8 out of 10.