UpdraftPlus: WP Backup & Migration Plugin: Code execution
UpdraftPlus: WP Backup & Migration Plugin is affected by code execution. The vulnerable path is reachable without authentication. Successful exploitation can run attacker-controlled code in the WordPress hosting account. The published affected range is <= 1.26.4.
- Component
- UpdraftPlus: WP Backup & Migration Plugin
- Plugin slug
updraftplus-wp-backup-migration-plugin- Affected
- <= 1.26.4
- Safe version
> 1.26.4- Published
- Jun 11, 2026
This CVE was published Jun 11, 2026 and is one of 1 known issue for this plugin.
Update, patch or deactivate.
Update UpdraftPlus: WP Backup & Migration Plugin to a release after 1.26.4, or disable and remove it until a fixed version is available.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The UpdraftPlus: WP Backup & Migration Plugin plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 1.26.4 via the UpdraftPlus_Remote_Communications_V2::wp_loaded function. This is due to insufficient validation of the remote communications message format, where signature verification can be bypassed and unchecked decryption return values collapse to a predictable all-zero encryption key. This makes it possible for unauthenticated attackers to forge arbitrary RPC commands and run them as the connected administrator, such as uploading and activating a malicious plugin, which ultimately leads to remote code execution.
CVE / CNA vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H