What is CVE-2026-19116?

CVE-2026-19116 is a high-severity vulnerability in User Frontend, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-09-02.

How severe is CVE-2026-19116?

High severity. CVSS v3 base score is 8.8 out of 10.

Deserialization in User Frontend

CVE-2026-19116

The User Frontend WordPress plugin before 4.3.11 does not prevent user-supplied field values from being deserialized when a submitted post is reopened in its frontend editing form, allowing authenticated users with subscriber-level access and above to perform PHP Object Injection, which may lead to remote code execution when a suitable gadget chain is present on the site.

Vulnerability class: Insecure Deserialization

Published 2026-09-02 · last modified 2026-09-03.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (34.3th percentile), scored 2026-10-17.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.004 · change: -0.001

Affected products

User Frontend

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

wpscan.com/vulnerability/019d83bd-24d3-4575-9d0b-55f75fdb0bfa/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-19116?: CVE-2026-19116 is a high-severity vulnerability in User Frontend, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-09-02.
How severe is CVE-2026-19116?: High severity. CVSS v3 base score is 8.8 out of 10.