XSS in Subscribe Forms
CVE-2026-91073
The Subscribe Forms WordPress plugin before 1.6.3 does not sanitise and escape one of its form settings before outputting it in a page, allowing authenticated users with the Author role and above to perform Stored Cross-Site Scripting attacks that execute in the browser of any visitor who views a page embedding the form, including logged-out visitors and administrators.
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 (12.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
- Subscribe Forms
Weakness classification (CWE)
References
- wpscan.com/vulnerability/50d0d5b6-2204-4af3-92d5-75085ce2f176/ (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-91073?
- CVE-2026-91073 is a medium-severity vulnerability in Subscribe Forms, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-09-23.
- How severe is CVE-2026-91073?
- Medium severity. CVSS v3 base score is 6.8 out of 10.