CVE-2025-49040 Overview
CVE-2025-49040 is a Cross-Site Request Forgery (CSRF) vulnerability [CWE-352] affecting the Backup Bolt WordPress plugin. The flaw impacts all versions up to and including 1.5.0. An attacker can craft a malicious web page that triggers unauthorized state-changing actions when an authenticated administrator visits it. Exploitation requires user interaction but no prior authentication on the attacker's side. The vulnerability affects the integrity of the WordPress site while confidentiality and availability remain unaffected.
Critical Impact
Successful exploitation allows attackers to force authenticated WordPress administrators to perform unintended actions within the Backup Bolt plugin, potentially altering backup configurations or triggering plugin operations without consent.
Affected Products
- Backup Bolt WordPress plugin versions up to and including 1.5.0
- WordPress installations with the Backup Bolt plugin enabled
- Administrator accounts on affected WordPress sites
Discovery Timeline
- 2025-08-27 - CVE-2025-49040 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-49040
Vulnerability Analysis
The Backup Bolt plugin fails to enforce anti-CSRF protections on one or more state-changing request handlers. WordPress plugins typically defend against CSRF by validating nonces generated with wp_create_nonce() and verified via check_admin_referer() or wp_verify_nonce(). When these controls are missing or improperly validated, any authenticated session can be abused by a remote attacker who tricks the victim into loading attacker-controlled content.
The attack requires user interaction, meaning the target administrator must click a link or visit a page under the attacker's control. Because the browser automatically attaches valid session cookies, the forged request executes with the victim's privileges. See the Patchstack advisory for additional context.
Root Cause
The root cause is the absence of adequate CSRF token validation on privileged endpoints exposed by the Backup Bolt plugin. Without nonce verification, the plugin cannot distinguish between requests initiated by the legitimate administrator and requests forged by a third-party site.
Attack Vector
The attack vector is network-based and requires no privileges. An attacker hosts a page containing an auto-submitting HTML form or an image tag pointing to a vulnerable Backup Bolt endpoint. When a logged-in WordPress administrator visits the malicious page, the browser submits the crafted request to the target site using the administrator's active session, causing the plugin to execute the attacker's intended action.
Detection Methods for CVE-2025-49040
Indicators of Compromise
- Unexpected changes to Backup Bolt plugin settings or backup schedules that do not correspond to legitimate administrator activity
- HTTP POST requests to Backup Bolt endpoints with Referer headers pointing to external, untrusted domains
- WordPress audit log entries showing administrative actions occurring shortly after an admin visited an unfamiliar URL
Detection Strategies
- Inspect web server access logs for requests to Backup Bolt plugin URLs that lack a valid nonce parameter or contain suspicious Referer headers
- Correlate administrator browsing telemetry with plugin configuration changes to identify request forgery patterns
- Deploy a Web Application Firewall (WAF) rule that flags cross-origin POST requests to /wp-admin/ endpoints without matching nonce tokens
Monitoring Recommendations
- Enable WordPress activity logging plugins to record administrative actions with source IP and referrer metadata
- Monitor for outbound clicks from administrator email accounts that lead to unknown domains, a common CSRF delivery vector
- Alert on modifications to backup-related files, schedules, or destinations outside approved change windows
How to Mitigate CVE-2025-49040
Immediate Actions Required
- Update the Backup Bolt plugin to a version later than 1.5.0 once the vendor releases a patched release
- Restrict WordPress administrator access to trusted networks and enforce separate browser profiles for administrative work
- Require administrators to log out of WordPress sessions when not actively performing management tasks
Patch Information
At the time of publication, refer to the Patchstack advisory for Backup Bolt for the latest fixed version information. Apply the vendor-supplied update through the WordPress plugin manager as soon as it becomes available.
Workarounds
- Deactivate the Backup Bolt plugin until a patched version is installed
- Deploy a WAF ruleset that enforces SameSite=Strict cookie behavior and blocks cross-origin state-changing requests to /wp-admin/
- Implement browser isolation or dedicated administrative workstations to reduce the likelihood of administrators triggering forged requests
# Example: temporarily disable the plugin via WP-CLI until a patch is available
wp plugin deactivate backup-bolt
# Verify the plugin status
wp plugin status backup-bolt
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
