CVE-2026-87974 Asaas CVE debrief

Who should care

Defenders responsible for WordPress installations using the Asaas Gateway for WooCommerce plugin should assess exposure and prioritize verification and updates. This includes reviewing and adjusting webhook authentication and authorization settings, monitoring for potential abuse, and verifying affected scope and severity.

Why it matters

The vulnerability allows unauthenticated attackers to bypass payment authentication, potentially leading to financial impacts and requiring defenders to verify and update affected systems.

• Unauthenticated attackers can mark arbitrary orders as paid
• Potential financial impact due to unauthorized order modifications
• Need for verification and updates to prevent exploitation

Technical summary

The Asaas Gateway for WooCommerce WordPress plugin before 2.7.8 does not properly authenticate its payment webhook, accepting an empty access token in its default configuration and not verifying that the confirmed payment corresponds to the order it marks paid. This allows unauthenticated attackers to mark arbitrary orders as paid, potentially leading to financial impacts. Defenders should prioritize verifying and updating Asaas Gateway for WooCommerce installations to version 2.7.8 or later, and monitor for potential abuse of the payment webhook.

Defensive priority

Defenders should prioritize verifying and updating Asaas Gateway for WooCommerce installations to version 2.7.8 or later, and monitor for potential abuse of the payment webhook.

Recommended defensive actions

• Verify and update Asaas Gateway for WooCommerce installations to version 2.7.8 or later
• Monitor for potential abuse of the payment webhook
• Review and adjust webhook authentication and authorization settings
• 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 CVE record and source item provide details on the vulnerability, but limited information is available on potential exploitation or affected systems. Defenders should verify the affected scope, review official advisories, and plan vendor-supported updates or mitigations. The vulnerability allows unauthenticated attackers to bypass payment authentication, potentially leading to financial impacts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.