CVE-2026-76549: UpdraftPlus WordPress Plugin CSRF Vulnerability

CVE-2026-76549 Overview

CVE-2026-76549 is a Cross-Site Request Forgery (CSRF) vulnerability in the UpdraftPlus: WP Backup & Migration Plugin for WordPress. Versions before 1.26.7 do not implement CSRF checks on one of the plugin's backup management actions. An attacker who convinces a logged-in administrator to click a crafted link can force the site to restore an existing backup. The restoration reverts the site's database and files to an earlier state, causing data loss and potential reintroduction of previously removed content or configurations.

Critical Impact
A single crafted link clicked by an authenticated administrator can roll back an entire WordPress site's database and files to a prior backup, resulting in destructive integrity loss.

Affected Products

UpdraftPlus: WP Backup & Migration Plugin for WordPress before version 1.26.7
WordPress sites with an authenticated administrator session active during attack
Any environment relying on UpdraftPlus for backup and restoration workflows

Discovery Timeline

2026-08-27 - CVE-2026-76549 published to NVD
2026-08-27 - Last updated in NVD database

Technical Details for CVE-2026-76549

Vulnerability Analysis

The vulnerability is a classic Cross-Site Request Forgery flaw [CWE-352] in a privileged backup management action exposed by UpdraftPlus. WordPress plugins are expected to validate a nonce on any state-changing request using check_admin_referer() or wp_verify_nonce(). The affected action in versions prior to 1.26.7 accepts requests without validating an anti-CSRF token. As a result, the server cannot distinguish a legitimate administrator action from a forged cross-origin request that rides on the administrator's authenticated session.

Exploitation does not require the attacker to steal credentials or bypass authentication. The attacker only needs a target administrator to visit an attacker-controlled page or click a crafted link while logged in to WordPress. The browser automatically attaches the WordPress session cookies to the forged request, and the plugin executes the restore operation as if the administrator had initiated it.

Root Cause

The root cause is missing CSRF protection on a backup management endpoint. The affected handler in UpdraftPlus does not verify a WordPress nonce before invoking the backup restore workflow. Any request that reaches the endpoint with a valid admin session is treated as authorized, violating the principle that state-changing operations must require a token unpredictable to third-party origins.

Attack Vector

The attack is delivered over the network through the victim's browser. An attacker hosts a page containing an auto-submitting form or an image or link that targets the vulnerable UpdraftPlus action on the victim's site. When a logged-in WordPress administrator visits the page, the browser issues the request with valid authentication cookies. The plugin restores an existing backup, reverting the site's database tables and files. Consequences include content loss for changes made after the restored backup, reintroduction of previously patched vulnerable plugins or themes, credential rollback, and integrity loss across the site.

See the WPScan Vulnerability Report for additional technical detail.

Detection Methods for CVE-2026-76549

Indicators of Compromise

Unexpected entries in the UpdraftPlus restoration log at wp-content/updraft/log.*.txt referencing a restore action that no administrator initiated.
WordPress content, options, or user tables reverting to an older state without a documented change window.
HTTP referer headers on admin-ajax or admin-post requests pointing to an external, untrusted origin immediately before a restore event.
Plugin, theme, or wp_options values reverting to versions or configurations known to be prior to the current release cycle.

Detection Strategies

Review web server access logs for POST or GET requests targeting UpdraftPlus admin endpoints where the Referer or Origin header does not match the site's own hostname.
Alert on any restore-related activity in UpdraftPlus logs that lacks a corresponding administrator-initiated action in your change management system.
Correlate WordPress user_meta and session activity with restore events to determine which administrator's session was used.

Monitoring Recommendations

Ingest WordPress and web server logs into a centralized platform and alert on restore events outside approved maintenance windows.
Monitor filesystem changes under wp-content/ and database schema or row-level changes for unexplained reversions.
Track outbound links administrators click from webmail or messaging platforms that target the WordPress admin URL.

How to Mitigate CVE-2026-76549

Immediate Actions Required

Update UpdraftPlus: WP Backup & Migration Plugin to version 1.26.7 or later on every WordPress site in your estate.
Audit UpdraftPlus restore logs and WordPress content for evidence of unauthorized restore operations since the plugin was installed.
Require administrators to log out of WordPress sessions when not actively performing administrative work.

Patch Information

The vendor addressed the missing CSRF check in UpdraftPlus version 1.26.7. Upgrade all installations of the plugin to 1.26.7 or later. Refer to the WPScan Vulnerability Report for advisory details.

Workarounds

Restrict access to the WordPress admin interface using IP allow-listing or a VPN so that CSRF payloads cannot reach the endpoint from arbitrary origins.
Deploy a web application firewall rule that blocks requests to UpdraftPlus admin endpoints when the Referer or Origin header is missing or off-site.
Use a browser profile dedicated to WordPress administration and avoid browsing untrusted content while authenticated.

bash

# Example WAF rule (ModSecurity) blocking cross-origin requests to UpdraftPlus endpoints
SecRule REQUEST_URI "@rx (options-general\.php\?page=updraftplus|admin-ajax\.php)" \
  "chain,phase:1,deny,status:403,id:1026765,\
   msg:'Blocked cross-origin request to UpdraftPlus admin endpoint (CVE-2026-76549)'"
  SecRule REQUEST_HEADERS:Referer "!@beginsWith https://your-wordpress-site.example/" \
    "t:none"