CVE-2026-15283: WPvivid Backup for MainWP <= 0.9.33 - Authenticated (Admin+) Stored Cross-Site Scripting
The WPvivid Backup for MainWP plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 0.9.33 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfilteredhtml has been disabled.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
WordPress plugin: WPvivid Backup for MainWPto a version that resolves this vulnerability.Fixed in 0.9.33 - Compensating control
Apply a compensating control by adjusting WordPress configuration so the vulnerable condition is not met: ensure unfiltered_html remains disabled for the affected environment (issue is stated to only affect installations where unfiltered_html has been disabled).
Event History
Frequently Asked Questions
What is the severity of CVE-2026-15283?
CVE-2026-15283 has a medium severity rating of 4.4.
How do I fix CVE-2026-15283?
To fix CVE-2026-15283, update the WPvivid Backup for MainWP plugin to version 0.9.34 or later.
What type of vulnerability is CVE-2026-15283?
CVE-2026-15283 is a Stored Cross-Site Scripting (XSS) vulnerability.
What can exploit CVE-2026-15283?
Authenticated attackers with administrator-level privileges can exploit CVE-2026-15283 due to insufficient input sanitization.
Which versions are affected by CVE-2026-15283?
CVE-2026-15283 affects all versions of the WPvivid Backup for MainWP plugin up to and including 0.9.33.