CVE-2025-48308
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 nonletter Newsletter subscription optin module newsletter-subscription-widget-for-sendblaster allows Stored XSS.This issue affects Newsletter subscription optin module: from n/a through <= 1.2.9.
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 the newsletter-subscription-widget-for-sendblaster plugin allows attackers to craft malicious requests that result in Stored XSS. An unauthenticated attacker can trick an authenticated administrator into submitting a request that injects malicious scripts into subscription form fields, which then execute when viewed by other users.
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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Confirm the plugin is installedIn WordPress admin, go to Plugins > Installed Plugins and look for 'newsletter-subscription-widget-for-sendblaster' or check the plugin files in wp-content/plugins/ for a folder containing 'sendblaster'Affected if The plugin is installed and active
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Identify the installed versionIn WordPress admin Plugins list, click on the plugin to view details and note the version number, or inspect the main plugin PHP file for a 'Version:' comment headerAffected if The version is older than the patched version (compare against the latest version on the WordPress plugin repository)
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Check if the subscription widget is in useGo to Appearance > Widgets (or Block Editor widgets) and look for the SendBlaster subscription widget placed on any pages, posts, or sidebar areasAffected if The widget is active on any public-facing page
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Inspect form field configurations for malicious scriptsNavigate to the widget settings in Widgets admin area. Check all subscription form fields (name, email, custom fields) for suspicious JavaScript tags, event handlers (onerror, onload, etc.), or encoded payloadsAffected if Any form field contains script tags or suspicious JavaScript code that was not intentionally added by an administrator
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Review recent admin activity for unauthorized form savesCheck WordPress activity logs or server access logs for POST requests to the widget admin page from unexpected IP addresses, or look at the wp_options table for widget configurations saved at unusual timesAffected if Widget configuration was modified without administrator awareness or from an unusual source
A user is affected if the plugin is installed and the subscription widget contains injected malicious scripts in its form fields, or if the widget is active on public pages without CSRF protection in place.
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 the latest patched version of the plugin. Until a patch is available, disable the newsletter subscription widget or implement CSRF tokens on all form submissions and sanitize all user inputs.
- 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-2025-48308 — 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-2025-48308 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