What is CVE-2026-88903?

CVE-2026-88903 is a high-severity vulnerability in Topcontent, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-10-11.

How severe is CVE-2026-88903?

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

XSS in Topcontent

CVE-2026-88903

The Topcontent WordPress plugin through 1.2.1 does not properly authorise one of its request handlers and disables HTML sanitisation before storing the submitted content, allowing unauthenticated attackers to publish arbitrary posts containing malicious JavaScript on any site where its API key has never been configured.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-11 · last modified 2026-10-11.

CVSS v3 metric

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

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

Topcontent

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wpscan.com/vulnerability/173b07dd-6404-49c0-9e01-90b5b68d1dec/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-88903?: CVE-2026-88903 is a high-severity vulnerability in Topcontent, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-10-11.
How severe is CVE-2026-88903?: High severity. CVSS v3 base score is 8.8 out of 10.