What is CVE-2026-86709?

CVE-2026-86709 is a critical-severity vulnerability in The Pressengine, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-09-17.

How severe is CVE-2026-86709?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in The Pressengine

CVE-2026-86709

The Pressengine WordPress plugin through 1.0 does not stop its login handler from issuing a session when authentication fails, allowing unauthenticated attackers to log in as any user, including administrators.

Vulnerability class: Broken Authentication

Published 2026-09-17 · last modified 2026-09-18.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (50.0th percentile), scored 2026-11-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

The Pressengine

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

wpscan.com/vulnerability/4b0b16eb-c638-479b-ab65-1cead53f32a8/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-86709?: CVE-2026-86709 is a critical-severity vulnerability in The Pressengine, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-09-17.
How severe is CVE-2026-86709?: Critical severity. CVSS v3 base score is 9.8 out of 10.