XSS in Vikwidgetsloader

CVE-2026-84899

The VikWidgetsLoader WordPress plugin before 1.12.0 does not sanitise or escape a block attribute before outputting it inside an inline script, allowing users with the Contributor role to store arbitrary JavaScript that executes in the browser of any user viewing the affected post, including the administrator who reviews the pending submission.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (36.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.0% 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-2026-84899: held from 0.002 to 0.004.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

  • Vikwidgetsloader

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-84899?
CVE-2026-84899 is a medium-severity vulnerability in Vikwidgetsloader, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-09-05.
How severe is CVE-2026-84899?
Medium severity. CVSS v3 base score is 6.8 out of 10.