XSS in Optima Express Idx

CVE-2026-96899

The Optima Express IDX WordPress plugin before 8.7.6 does not properly neutralise a script value submitted through one of its REST endpoints before storing it and echoing it into the document head when the post is rendered, allowing users with a role as low as author to perform Stored Cross-Site Scripting attacks.

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: 0.002 (13.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.8% 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-2026-96899: held from 0.002 to 0.002.

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

Affected products

  • Optima Express Idx

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-96899?
CVE-2026-96899 is a medium-severity vulnerability in Optima Express Idx, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-09-27.
How severe is CVE-2026-96899?
Medium severity. CVSS v3 base score is 6.8 out of 10.