CVE-2026-42658
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 · uneditedUnauthenticated Cross Site Scripting (XSS) in Classified Listing <= 5.3.8 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 · moderate confidenceAn unauthenticated Cross Site Scripting (XSS) vulnerability exists in the Classified Listing plugin for versions up to and including 5.3.8. Attackers can inject malicious scripts through unsanitized input fields without needing authentication, potentially allowing session hijacking or credential theft against site administrators or 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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Check installed plugin versionNavigate to WordPress admin dashboard > Plugins > Installed Plugins > look for Classified Listing (or RT-Theme plugins) and locate the version number displayed in the plugin detailsAffected if The displayed version is 5.3.8 or lower (any version up to and including 5.3.8)
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Confirm plugin is activeIn the WordPress admin under Plugins, verify that the Classified Listing plugin shows as 'Active'Affected if The plugin is active and the version falls within the affected range
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Identify publicly accessible input formsVisit the frontend of the WordPress site and look for any listing submission forms, search fields, or user input forms created by the Classified Listing plugin. These are typically found on pages with URLs containing /classifieds/, /listing/, or similar pathsAffected if The plugin exposes public-facing input forms and the version is within the affected range (5.3.8 or lower)
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Review available attack surfaceCheck if the site allows guest submissions or public listings without requiring user registration or login. Look for options like 'Allow Guest Submissions' or similar settings in the plugin configuration under Classified Listing > SettingsAffected if The plugin has guest/public submission capabilities enabled and the version is 5.3.8 or lower
If the Classified Listing plugin is installed and active at version 5.3.8 or any lower version, the environment is vulnerable to unauthenticated XSS attacks via unsanitized input fields.
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 dataUpgrade to a patched version of the Classified Listing plugin (later than 5.3.8) which implements proper input sanitization and output encoding. If patching is not immediately possible, disable the plugin or restrict access to affected endpoints via web application firewall rules.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-42658 — 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-2026-42658 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