Browser And Operating System FinderWordPress extension · Browser And Operating System Finder Project
CVE-2021-20851
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 · uneditedCross-site request forgery (CSRF) vulnerability in Browser and Operating System Finder versions prior to 1.2 allows a remote unauthenticated attacker to hijack the authentication of an administrator via unspecified vectors.
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 confidenceCSRF vulnerability in Browser and Operating System Finder plugin versions prior to 1.2 allows remote unauthenticated attackers to trick authenticated administrators into performing unintended actions by sending malicious requests, potentially hijacking administrative sessions.
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
Browser And Operating System FinderWordPress extension
< 1.2CVSS 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:3.1/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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Locate the Browser and Operating System Finder pluginAccess your site's plugin management interface or inspect the plugin directory for a folder named 'browser-and-operating-system-finder' or similar variantsAffected if The plugin is present in the plugin directory or listed in the site's plugin inventory
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Identify the installed version numberOpen the main plugin file (such as index.php, main.php, or a dedicated version file) and locate the version declaration in the plugin header or metadataAffected if The displayed version number is lower than 1.2 (for example, 1.1, 1.0, or no version specified)
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Verify the plugin is activeCheck the admin dashboard plugin status or query the site's plugin activation state to confirm the plugin is currently enabledAffected if The plugin is installed and currently active on the site
Your environment is affected if the Browser and Operating System Finder plugin is installed and active with a version lower than 1.2, and an authenticated administrator session can be targeted for CSRF exploitation.
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.
dbcve · scoped1.2
Implement anti-CSRF tokens (synchronizer token pattern) on all state-changing forms and validate tokens server-side, or upgrade to version 1.2 which contains the fix. Enable SameSite cookie attributes as an additional defense layer.
1.2
- Log in to the WordPress admin dashboard
- Navigate to the Plugins section
- Locate the 'Browser and Operating System Finder' plugin in the list
- Click the 'Update now' link or button if an update is available, or manually update by uploading version 1.2
- Verify the plugin is updated to version 1.2 by checking the installed version number
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Browser And Operating System Finder
Scoped from the published advisory
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 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 $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20851 — 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-2021-20851 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