CVE-2026-3881
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 · uneditedThe Performance Monitor WordPress plugin through 1.0.6 does not validate a parameter before making a request to it, which could allow unauthenticated users to perform SSRF attacks
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 · moderate confidenceThe Performance Monitor WordPress plugin (versions up to 1.0.6) is vulnerable to Server-Side Request Forgery (SSRF) due to improper validation of a parameter before using it in server-side HTTP requests. Unauthenticated attackers can supply arbitrary URLs via this parameter, causing the vulnerable WordPress server to make requests to attacker-controlled or internal infrastructure.
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
- Changed
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/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 checksWork through these to decide whether this CVE applies to you.
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Confirm Performance Monitor plugin is installedIn WordPress admin, go to Plugins > Installed Plugins and look for 'Performance Monitor' in the list. Alternatively, check the /wp-content/plugins/ directory for a folder named 'performance-monitor' or similar.Affected if The plugin is present and active in the WordPress installation
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Identify the installed plugin versionIn the WordPress plugin list, click on the plugin name or view the plugin's main PHP file header to read the 'Version' field. Compare this version number to the affected range (versions up to 1.0.6).Affected if The installed version is 1.0.6 or any earlier version
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Check for exposed plugin endpointsReview the plugin's publicly accessible AJAX endpoints or admin-ajax.php handlers by examining the plugin code in /wp-content/plugins/. Look for any parameters that accept URLs or hostnames that could be used for SSRF.Affected if The plugin exposes an endpoint that accepts URL parameters without proper validation
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Review server access logs for suspicious outbound requestsExamine Apache/nginx access logs and WordPress debug logs for requests to the plugin's endpoint followed by unusual outbound HTTP requests to unfamiliar domains, internal IPs, or cloud metadata services.Affected if Logs show the affected plugin endpoint being used to make requests to attacker-controlled or internal infrastructure
The environment is affected if the Performance Monitor plugin (versions up to 1.0.6) is installed and active, as unauthenticated attackers can abuse the vulnerable URL parameter to force the server to make arbitrary HTTP requests.
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 to a patched version of the plugin once available. Until then, restrict server outbound access to trusted domains only and consider disabling the plugin if the functionality is not critical.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-3881 — 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-2026-3881 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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- 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