Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform vulnerabilities
Plugin slug ultimate-multisite · 3 known vulnerabilities · latest disclosed 2026-10-14 · WordPress.org page
Every listed vulnerability has a fix. Version 2.17.2 or later is not affected by any of them. If your site runs an older version, update it.
3 of 3 rated high or critical (CVSS 7 or more).
Known vulnerabilities in Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform
| Severity | Affected versions | Fixed in | CVE | Published | Details |
|---|---|---|---|---|---|
| High 8.1 | < 2.17.2 | 2.17.2 | CVE-2026-107508 | 2026-10-14 | Advisory |
| High 7.3 | <= 2.16.0 | 2.17.0 | CVE-2026-103646 | 2026-10-06 | Advisory |
| Critical 9.8 | <= 2.15.0 | 2.15.1 | CVE-2026-75957 | 2026-09-30 | Advisory |
Check if a site is affected
Enter a site address to see which version of Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform and other plugins it runs, and whether they match a known vulnerability.
Questions
Is the Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform plugin safe to use?
All 3 known issues are fixed in current versions (2.17.2 or later). Keeping it updated is what matters.
How do I check which version of Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform my site runs?
In WordPress go to Plugins > Installed Plugins. From the outside, the free PluginPeek scan below reads the version from the site's public files.
How do I fix a vulnerable plugin?
Make a full backup, then update it from Dashboard > Updates and check the site afterwards. If you would rather not, we can do it for a fixed $99, paid after you have checked the site.