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Cross-site Scripting (XSS)Weakness · CWE-79

CVE-2026-56039

HIGH · 7.1 CVSS v3.1 Published 2026-06-26
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
Remotely reachable No privileges 8 weeks old

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 · unedited
Unauthenticated Cross Site Scripting (XSS) in Quick Interest Slider <= 3.1.6 versions.

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 confidence

An unauthenticated Cross Site Scripting (XSS) vulnerability exists in the Quick Interest Slider WordPress plugin affecting versions 3.1.6 and below. Attackers can inject malicious JavaScript into the plugin without requiring authentication, potentially allowing session hijacking or credential theft.

MitigationUpdate Quick Interest Slider to the latest version (above 3.1.6) or deactivate/remove the plugin until a patched version is available.

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 checks

Work through these to decide whether this CVE applies to you.

  1. Confirm plugin installation
    Navigate to WordPress admin > Plugins and locate 'Quick Interest Slider' in the list of installed plugins
    Affected if Plugin is installed and active
  2. Identify installed version
    In the Plugins list, click on the plugin to view details, or check the plugin header in /wp-content/plugins/quick-interest-slider/quick-interest-slider.php for the 'Version' field
    Affected if Version is 3.1.6 or lower
  3. Verify unauthenticated accessibility
    Since this is an unauthenticated XSS, the vulnerable endpoint is accessible without login. Confirm the plugin is publicly accessible by checking if any shortcode or widget from the plugin is published on a public page
    Affected if Plugin is active and its features are accessible to unauthenticated users
  4. Check for signs of exploitation
    Review website source code or server logs for unexpected script tags, particularly in areas where the plugin renders user input. Look for encoded or obfuscated JavaScript in request logs targeting plugin endpoints
    Affected if Suspicious script injections are found in plugin-related requests or page output

User is affected if Quick Interest Slider plugin version 3.1.6 or below is installed and active, with its features exposed to unauthenticated users.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update Quick Interest Slider to the latest version (above 3.1.6) or deactivate/remove the plugin until a patched version is available.

Have this fixed Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-56039 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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