Wp Fastest CacheWordPress extension · Wpfastestcache
CVE-2015-4089
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 · uneditedMultiple cross-site request forgery (CSRF) vulnerabilities in the optionsPageRequest function in admin.php in WP Fastest Cache plugin before 0.8.3.5 for WordPress allow remote attackers to hijack the authentication of unspecified victims for requests that call the (1) saveOption, (2) deleteCache, (3) deleteCssAndJsCache, or (4) addCacheTimeout method via the wpFastestCachePage parameter in the WpFastestCacheOptions/ page.
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 confidenceMultiple CSRF vulnerabilities in the optionsPageRequest function in admin.php of the WP Fastest Cache WordPress plugin before version 0.8.3.5 allow remote attackers to hijack administrator authentication for requests calling saveOption, deleteCache, deleteCssAndJsCache, or addCacheTimeout methods via the wpFastestCachePage parameter.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Wp Fastest CacheWordPress extension
<= 0.8.3.4CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 checksWork through these to decide whether this CVE applies to you.
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Check installed WP Fastest Cache versionLog into WordPress admin and navigate to Plugins > Installed Plugins. Locate WP Fastest Cache and read the version number displayed. Alternatively, check the main plugin file (typically wp-content/plugins/wp-fastest-cache/wp-fastest-cache.php) and look for the version comment or defined constant.Affected if version is 0.8.3.4 or lower
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Verify the vulnerable admin.php file existsCheck if the file admin.php exists in the WP Fastest Cache plugin directory (wp-content/plugins/wp-fastest-cache/admin.php). This is where the optionsPageRequest function containing the CSRF flaw is located.Affected if admin.php file exists and is from version 0.8.3.4 or lower
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Confirm admin functionality is accessibleVerify that the WordPress site has an administrator account and that the WP Fastest Cache settings page is accessible via admin.php?page=wpfastestcacheoptions. The CSRF vulnerability affects requests to this admin page.Affected if logged-in administrator can access the plugin settings page and the saveOption, deleteCache, deleteCssAndJsCache, or addCacheTimeout methods are callable via the wpFastestCachePage parameter
You are affected if WP Fastest Cache version 0.8.3.4 or lower is installed and the plugin admin interface is accessible to logged-in administrators.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataUpdate WP Fastest Cache plugin to version 0.8.3.5 or later which implements CSRF token validation in the affected functions. Additionally, ensure administrators are educated about clicking untrusted links.
Fix this in Wp Fastest Cache
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-4089 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2015-4089 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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
- No spam, self-promotion, credentials, or personal data