CVE-2025-39421
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 Mustafa KUCUK WP Sticky Side Buttons wp-sticky-side-buttons allows Stored XSS.This issue affects WP Sticky Side Buttons: from n/a through <= 2.1.
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 confidenceCross-Site Request Forgery (CSRF) vulnerability in the WP Sticky Side Buttons WordPress plugin allows attackers to trick authenticated administrators into submitting malicious requests that result in Stored XSS. The lack of proper CSRF tokens enables attackers to inject persistent malicious scripts into the plugin's settings that execute when administrators or users view affected pages.
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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
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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Verify WP Sticky Side Buttons plugin is installedIn WordPress admin, go to Plugins > Installed Plugins and search for 'WP Sticky Side Buttons', or check the /wp-content/plugins/ directory for the sticky-side-buttons folderAffected if The plugin is present and active in the WordPress installation
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Check the installed plugin versionIn WordPress admin Plugins page, click on the plugin name to view version details, or read version from the plugin's main PHP file header commentAffected if The version is prior to the patched release - compare your version against the vendor's security advisory when available
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Inspect plugin settings for injected scriptsNavigate to the plugin settings page in WordPress admin (usually under Settings or a dedicated menu item for Sticky Side Buttons) and view the page source or examine form fields for suspicious script tags, iframe tags, or event handlersAffected if Unexpected JavaScript code, iframe sources, or on* event attributes are present in plugin configuration fields
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Review plugin form submissions for CSRF protectionExamine the plugin's PHP source code in /wp-content/plugins/sticky-side-buttons/ - check form tags for wp_nonce_field() or wp_nonce_url() calls, and verify AJAX actions include nonce verificationAffected if Forms and AJAX endpoints in the plugin code lack WordPress nonce verification or CSRF token validation
Your environment is affected if the WP Sticky Side Buttons plugin is active, contains a version without CSRF protection fixes, and either shows evidence of stored XSS in its settings or has forms/AJAX endpoints missing WordPress nonce validation.
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 dataImplement WordPress nonces and CSRF tokens on all forms and AJAX endpoints, combined with proper input sanitization and output escaping to prevent stored XSS. Update to a patched version when released by the vendor.
- Consultation2.0 h
- Implementation4.0 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 $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-39421 — 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-2025-39421 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