Booking Calendar and Notification <= 4.0.3 - Authentication Bypass
Strategic Overview
- Status
- Unpatched
- Affected Plugin
- Booking Calendar and Notification
- Affected Version
<= 4.0.3- CVSS
- 9.8Critical
- Weakness type
- CWE-288 · Authentication Bypass Using an Alternate Path or Channel
- CVE
CVE-2025-31381
At a glance
CVE-2025-31381 is a critical-severity Authentication Bypass Using an Alternate Path or Channel vulnerability in the Booking Calendar and Notification WordPress plugin, affecting versions <= 4.0.3. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. No fixed release has been reported yet; treat installations running this software as exposed. Disclosed April 2025, reported by Pham Van Tam.
Vulnerability Overview
The Booking Calendar and Notification plugin for WordPress is vulnerable to authentication bypass in all versions up to, and including, 4.0.3. This is due to the plugin not properly verifying a user's identity prior to logging them in. This makes it possible for unauthenticated attackers to log in as other users which makes privilege escalation possible.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-288: Authentication Bypass Using an Alternate Path or Channel
Reaching this weakness in Booking Calendar and Notification <= 4.0.3 takes a caller who can reach the endpoint. Authentication bypass through an alternate path means the application has a second route to a protected action that skips the checks the primary route performs.
The protection on the main path becomes irrelevant, because the attacker simply uses the route that never asks. No fixed build of this plugin is recorded for Booking Calendar and Notification yet, so installs running <= 4.0.3 stay exposed until the vendor ships one.
Remediation
No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. No patched version is recorded yet, which is the case where a filtering layer matters most, because there is nothing to update to.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Booking Calendar and Notification
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