PHP Vulnerability Responses by Company

Altstack (WP Maintenance Center)

Japan-based services
Aliases / services
Altstack / オルトスタック / WPメンテナンスセンター / WP Maintenance Center / Altstack (WP Maintenance Center)
Official website
https://wp-maint.jp/

Each response applies only to its stated service scope. “Not listed” does not mean unpatched or unaffected.

Response status by service

WP Maintenance Center WordPress maintenance and upgrades

Response status
Assessment and upgrade guidance
Response information checked
2026-10-27

Current re-audit: Official response verified · Research date: 2026-10-27

WordPress maintenance and remediation services.

Publishes PHP/WordPress checks, backup, compatibility and upgrade steps; it does not confirm every customer site is patched.

Scope: The third-party host roundup is not a patch claim for its own hosting.

What users should do

Check Site Health and vendor patch/backport status; arrange compatibility work where needed.

Official service URL

Source URLs

  1. PHP vulnerability response for WordPress siteshttps://wp-maint.jp/php-vulnerability-2026-10/Response evidence
  2. https://wp-maint.jp/blog/https://wp-maint.jp/blog/Service and operation documentation
Related official sources
  1. PHP vulnerability response for WordPress sitesOfficial notice

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