dbcve.org
Information ExposureWeakness · CWE-200

CVE-2026-5032

HIGH · 7.5 CVSS v3.1 Published 2026-04-02
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
The W3 Total Cache plugin for WordPress is vulnerable to information exposure in all versions up to, and including, 2.9.3. This is due to the plugin bypassing its entire output buffering and processing pipeline when the request's User-Agent header contains "W3 Total Cache", which causes raw mfunc/mclude dynamic fragment HTML comments — including the W3TC_DYNAMIC_SECURITY security token — to be rendered in the page source. This makes it possible for unauthenticated attackers to discover the value of the W3TC_DYNAMIC_SECURITY constant by sending a crafted User-Agent header to any page that contains developer-placed dynamic fragment tags, granted the site has the fragment caching feature enabled. With the leaked W3TC_DYNAMIC_SECURITY token, an attacker can craft valid mfunc tags to execute arbitrary PHP code on the server, achieving remote code execution.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The W3 Total Cache plugin for WordPress versions up to 2.9.3 contains an information disclosure vulnerability where the plugin bypasses its output buffering pipeline when the User-Agent header contains 'W3 Total Cache'. This causes raw mfunc dynamic fragment comments including the W3TC_DYNAMIC_SECURITY token to be exposed in page source. Attackers can use this leaked token to craft malicious mfunc tags achieving arbitrary PHP code execution.

MitigationUpdate W3 Total Cache to the latest patched version. If unable to update immediately, disable fragment caching feature and consider regenerating the security token after patching.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check installed W3 Total Cache version
    In WordPress admin, go to Plugins > Installed Plugins and find W3 Total Cache to view the version number. Alternatively, check the main plugin file (w3-total-cache.php) for the 'Version' header.
    Affected if The installed version is 2.9.3 or lower (any version up to and including 2.9.3).
  2. Verify if fragment caching is enabled
    In WordPress admin, navigate to W3 Total Cache > Performance > Fragment Cache. Check if the Fragment Cache feature is enabled or if mfunc support is active.
    Affected if Fragment caching with mfunc support is enabled, making the plugin vulnerable to token exposure.
  3. Inspect page source for leaked security token
    Make a request to any cached page with a User-Agent header containing 'W3 Total Cache' (e.g., 'User-Agent: W3 Total Cache/2.9.3'). View the page source and search for raw mfunc comments containing 'W3TC_DYNAMIC_SECURITY'.
    Affected if The page source reveals raw mfunc comments with the W3TC_DYNAMIC_SECURITY token instead of processed/cached content.
  4. Check output buffering behavior
    Review the W3 Total Cache plugin code, specifically the output buffering handler. Look for conditional logic that checks the User-Agent header and bypasses the normal caching pipeline when 'W3 Total Cache' is detected.
    Affected if The plugin code contains logic that bypasses output buffering or caching based on User-Agent, allowing raw fragment comments to be served.

You are affected if W3 Total Cache version is 2.9.3 or lower, fragment caching is enabled, and the W3TC_DYNAMIC_SECURITY token is exposed in page source when requesting with a 'W3 Total Cache' User-Agent header.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update W3 Total Cache to the latest patched version. If unable to update immediately, disable fragment caching feature and consider regenerating the security token after patching.

Recommended fix Moderate confidence

Latest available version of W3 Total Cache (check wordpress.org for current release beyond 2.9.3)

  1. Check the current version of W3 Total Cache plugin installed on your WordPress site
  2. Navigate to Plugins > Installed Plugins in WordPress admin to verify the version number
  3. Visit the W3 Total Cache plugin page at wordpress.org/plugins/w3-total-cache/ to check for any updates beyond version 2.9.3
  4. If a newer version is available, update the plugin through Plugins > Add New > Upload or directly via the Plugins page
  5. After updating, verify that fragment caching still works correctly by checking pages with dynamic fragments
  6. Review your site's pages to confirm the mfunc comments are no longer exposed in the source code
  7. Consider reviewing your W3TC_DYNAMIC_SECURITY token value in your wp-config.php file
Caveat Minor - verify fragment caching functionality works as expected after upgrade

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA3.0 h
18.0 hours of engineering $3,180
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-5032 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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