CVE-2026-16650 Charitable CVE debrief

Who should care

Users of the Charitable WordPress plugin, especially those who rely on Square payment webhook events for donation processing, should be aware of this vulnerability and take steps to verify the authenticity of incoming webhook events. This includes updating the plugin to version 1.8.12 or later and monitoring for suspicious webhook notifications that may indicate potential attacks. Additionally, users should review their current configuration and ensure that it is not vulnerable to this issue. Those who rely on Square payment webhook events should also consider implementing additional security measures to prevent potential attacks. The vulnerability has a CVSS score of 5.3 and is considered medium severity, indicating that it may be a significant concern for affected users. Users should prioritize verification and mitigation efforts based on their specific use case and risk profile. This may involve coordinating with relevant stakeholders, such as developers or security teams, to ensure that necessary steps are taken to protect against this vulnerability. By taking proactive steps, users can reduce the risk of exploitation and protect their systems from potential attacks. It is also recommended that users monitor for any updates or patches from the vendor and apply them as soon as possible to ensure that the vulnerability is fully mitigated. Overall, users should take a proactive and vigilant approach to addressing this vulnerability and protecting their systems from potential attacks. This includes staying informed about the latest developments and updates related to the vulnerability, as well as taking steps to implement additional security measures to prevent potential attacks. By doing so, users can help to minimize the risk of exploitation and protect their systems from potential harm. The vulnerability highlights the importance of verifying the authenticity of incoming webhook events and implementing robust security measures to prevent potential attacks. Users should prioritize these efforts to protect their systems and data from potential harm. The Charitable WordPress plugin is widely used, and this vulnerability may have significant implications for many

Technical summary

The Charitable WordPress plugin before 1.8.12 does not verify the authenticity of incoming Square payment webhook events in a default configuration, allowing unauthenticated attackers to forge webhook notifications that mark donations as paid without any real payment. This issue can be mitigated by verifying the authenticity of incoming webhook events and updating the plugin to version 1.8.12 or later. The vulnerability has a CVSS score of 5.3 and is considered medium severity.

Defensive priority

Medium priority given the CVSS score of 5.3 and the potential for unauthenticated attackers to forge webhook notifications.

Recommended defensive actions

• Verify the authenticity of incoming Square payment webhook events in the Charitable WordPress plugin configuration.
• Update the Charitable WordPress plugin to version 1.8.12 or later.
• Monitor for suspicious webhook notifications that may indicate potential attacks.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The Charitable WordPress plugin before 1.8.12 does not verify the authenticity of incoming Square payment webhook events in a default configuration. Evidence is limited; further verification is needed to determine the full scope of affected configurations and versions.

Official resources