Known vulnerabilities in Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform

Ultimate Multisite turns your WordPress network into a WaaS platform with subscriptions, site provisioning, and domain mapping.

3Reported vulnerabilities

9.8Highest CVSS score

2.16.1Latest version

70+Active installs

What to do now

Update Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform to 2.17.2 or later. 3 of these have a fixed version available. Updating resolves them.

Plugin last updated: September 12, 2026 / Tested up to WordPress: 7.1.2 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2026-75957	Critical 9.8	0.6%	0 to 2.15.0 (inclusive)	`2.15.1`	October 1, 2026
CVE-2026-107508	High 8.1	0.5%	Before 2.17.2	`2.17.2`	October 14, 2026
CVE-2026-103646	High 7.3	0.4%	2.16.0 and earlier	`2.17.0`	October 6, 2026

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.