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CVE-2026-13399 – Authorization Bypass / Payment Bypass – Payment Plugins for PayPal WooCommerce befo

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Summary

CVE-2026-13399 is a missing authorization vulnerability in the Payment Plugins for PayPal WooCommerce WordPress plugin in all versions before 2.0.20. A REST endpoint lacks proper authorization checks, allowing unauthenticated users to bypass payments. The issue is rated HIGH severity (CVSS 7.5).

Technical details

  • Root cause: A REST API endpoint exposed by the plugin does not enforce proper authorization checks (CWE-862 Missing Authorization; CWE-639 Authorization Bypass Through User-Controlled Key).
  • Trigger conditions: An unauthenticated actor invokes the affected REST endpoint directly, with no prior authentication or user interaction required.
  • Attack vector: Network — the endpoint is reachable remotely over HTTP(S).
  • Impact: Attackers can bypass the payment flow, undermining the integrity of order/payment processing. Impact is to integrity only; confidentiality and availability are unaffected.

Affected software

  • Payment Plugins for PayPal WooCommerce WordPress plugin: all versions before 2.0.20.

Severity

  • CVSS v3.1 Base Score: 7.5 (HIGH)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Mitigation and recommended actions

  • Immediate: Upgrade the Payment Plugins for PayPal WooCommerce plugin to version 2.0.20 or later.
  • If no patch can be applied: Restrict network access to the plugin’s REST endpoints (for example via a WAF rule or reverse-proxy restriction), and monitor for orders marked paid without a corresponding settled PayPal transaction.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw HTTP response body: /wp-content/plugins/pymntpl-paypal-woocommerce/

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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