CVE-2026-57421
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 · uneditedImproper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in CRM Perks CRM Perks Forms crm-perks-forms allows Reflected XSS.This issue affects CRM Perks Forms: from n/a through <= 1.1.7.
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 confidenceA reflected XSS vulnerability in CRM Perks Forms plugin allows attackers to inject malicious JavaScript through unsanitized user input that gets reflected back in web pages without proper encoding.
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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Identify if CRM Perks Forms plugin is installedCheck the WordPress plugins directory or examine the plugin files for 'crm-perks-forms' or similar naming. In file system, look for plugin folders under wp-content/plugins/ containing CRM Perks Forms code.Affected if The plugin directory exists and contains CRM Perks Forms files.
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Determine installed plugin versionOpen the main plugin PHP file (usually named plugin-name.php) and locate the version comment/header, or check for a version constant defined in the plugin code.Affected if The version found is earlier than the patched version that implements proper input sanitization.
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Verify plugin is activeCheck if the plugin is enabled in the WordPress admin panel under Plugins > Installed Plugins, or query the wp_options table for active plugin status.Affected if The plugin is currently active on the WordPress site.
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Test for reflected XSS via form submissionSubmit a test payload with a benign XSS probe (such as a parameter value like <script>alert(1)</script>) to any CRM Perks Forms shortcode or form endpoint. Observe if the payload is reflected unchanged in the page response without HTML encoding.Affected if The submitted input is reflected back in the HTML response without being sanitized or encoded.
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Inspect HTTP responses for unsanitized parametersUse browser developer tools or a proxy to capture form submission requests. Examine the resulting page HTML to see if any GET/POST parameters are echoed back without proper HTML entity encoding.Affected if User-supplied parameter values appear literally in the response HTML rather than as encoded entities.
If CRM Perks Forms is installed, active, and user input is reflected without HTML encoding in form responses, the environment is affected by this reflected XSS vulnerability.
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 CRM Perks Forms to a patched version that implements proper input sanitization and output encoding, or apply web application firewall rules to block XSS payloads.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-57421 — 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-2026-57421 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
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