CVE-2026-13694: Bit Form WordPress Auth Bypass Flaw

CVE-2026-13694 Overview

CVE-2026-13694 affects the Bit Form WordPress plugin in versions before 3.1.0. The plugin fails to properly validate its workflow-trigger token after the associated transient has expired. Unauthenticated attackers can abuse this flaw to re-trigger a form's configured workflow actions, including notification emails and third-party integrations. The issue is classified as Missing Authorization [CWE-862] and is exploitable remotely over the network without user interaction.

Critical Impact
Unauthenticated attackers can replay expired workflow-trigger tokens to fire off form workflows repeatedly, causing unwanted notification emails, integration calls, and downstream side effects.

Affected Products

Bit Form WordPress plugin versions prior to 3.1.0

Discovery Timeline

2026-07-21 - CVE-2026-13694 published to NVD
2026-07-21 - Last updated in NVD database

Technical Details for CVE-2026-13694

Vulnerability Analysis

The Bit Form plugin implements a workflow-trigger mechanism that fires configured actions when a form is submitted. Each trigger is protected by a token stored in a WordPress transient with a defined expiration window. The plugin verifies the token's presence but does not enforce a validity check once the transient has expired. As a result, an attacker who observes or guesses a workflow-trigger token can replay it to re-execute the associated workflow. The workflow actions include sending notification emails and invoking external integrations configured by the site administrator.

The flaw is categorized as Missing Authorization [CWE-862] because the plugin permits an action to proceed without a valid authorization check on the trigger token's lifecycle state.

Root Cause

The root cause is incomplete token validation logic. When the transient backing the workflow-trigger token expires, the plugin does not reject subsequent requests that reference the same token identifier. Instead, the workflow handler proceeds to execute the configured actions, treating the request as legitimate. There is no re-authentication, nonce refresh, or state check that ties the token to an active session or an unconsumed submission.

Attack Vector

Exploitation requires network access to the target WordPress site running a vulnerable version of Bit Form. The attacker submits a crafted request that references an expired workflow-trigger token to the plugin's public workflow endpoint. No authentication or user interaction is needed. Each successful request re-fires the form's configured workflow, which can generate spam notifications, trigger repeated calls to integrations such as CRMs or webhooks, and consume email quota. Refer to the WPScan Vulnerability Report for technical details.

Detection Methods for CVE-2026-13694

Indicators of Compromise

Repeated POST requests to Bit Form workflow endpoints from a single IP or small set of IPs in a short time window.
Bursts of duplicate notification emails or duplicate records appearing in integrated CRMs, webhooks, or ticketing systems.
Web server access logs showing requests reusing the same workflow-trigger token identifier across separated time intervals.

Detection Strategies

Review WordPress and web server logs for anomalous volumes of requests to Bit Form plugin endpoints, particularly those carrying trigger tokens.
Correlate outbound SMTP and integration API traffic with inbound requests to the plugin to identify replayed workflow executions.
Deploy a Web Application Firewall (WAF) rule to flag repeated use of the same workflow-trigger token parameter value.

Monitoring Recommendations

Alert on sudden increases in outbound emails originating from the WordPress host.
Track integration API call volume for anomalies tied to form submissions.
Monitor plugin update status to detect sites running Bit Form versions below 3.1.0.

How to Mitigate CVE-2026-13694

Immediate Actions Required

Upgrade the Bit Form WordPress plugin to version 3.1.0 or later on all affected sites.
Audit recent notification emails and integration activity for evidence of replayed workflows.
Rotate credentials or API keys for any third-party integrations that may have been invoked without authorization.

Patch Information

The vendor addressed the issue in Bit Form version 3.1.0 by adding proper validation of the workflow-trigger token's transient state. Sites should update through the WordPress plugin manager or by downloading the latest release from the plugin repository. See the WPScan Vulnerability Report for advisory details.

Workarounds

Temporarily disable the Bit Form plugin on sites that cannot be updated immediately.
Restrict access to the WordPress site's form submission endpoints using a WAF or IP allowlist while the patch is deployed.
Rate-limit requests to the plugin's workflow endpoints to reduce the impact of token replay attempts.

bash

# Example WAF rate-limit rule (nginx) restricting workflow endpoint abuse
limit_req_zone $binary_remote_addr zone=bitform:10m rate=5r/m;

location ~* /wp-admin/admin-ajax.php {
    limit_req zone=bitform burst=10 nodelay;
}