CVE-2025-50866
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 · uneditedCloudClassroom-PHP-Project 1.0 contains a reflected Cross-site Scripting (XSS) vulnerability in the email parameter of the postquerypublic endpoint. Improper sanitization allows an attacker to inject arbitrary JavaScript code that executes in the context of the user s browser, potentially leading to session hijacking or phishing attacks.
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 confidenceCloudClassroom-PHP-Project 1.0 has a reflected XSS vulnerability in the email parameter of the postquerypublic endpoint. The application fails to sanitize user input in the email field, allowing attackers to inject malicious JavaScript that executes in victims' browsers.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 1.0CVSS 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
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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 installed version of CloudclassroomLocate version information in the application's source code, README file, or configuration files. Check the main PHP files or any version.php file for a version marker indicating 1.0.Affected if The installed version is Vishalmathur Cloudclassroom 1.0
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Locate the postquerypublic endpointSearch the web root directory for the file containing the postquerypublic endpoint. This is typically a PHP file handling public query submissions. Look for files that process form submissions with an email parameter.Affected if The postquerypublic endpoint file exists in the application
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Inspect email parameter handling in postquerypublicOpen the postquerypublic endpoint file and locate the code that processes the email parameter. Examine how the email value is handled before being output in the response.Affected if The email parameter value is directly inserted into HTML output without sanitization or encoding
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Check for input validation functionsSearch the endpoint file for functions that validate or sanitize input such as htmlspecialchars, strip_tags, or any email format validation regex. Check if the email parameter passes through any validation before being displayed.Affected if No input validation or output encoding functions are applied to the email parameter before it is rendered in the response
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Test for reflected XSSSubmit a request to the postquerypublic endpoint with a test payload in the email parameter (e.g., <script>alert(1)</script>) and examine if the payload is reflected unmodified in the response HTML.Affected if The submitted payload is reflected in the response without being encoded or sanitized, allowing script execution
A user is affected if they are running Vishalmathur Cloudclassroom version 1.0 and the postquerypublic endpoint reflects the email parameter without sanitization, allowing injected JavaScript to execute in victims' browsers.
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 proper input validation for the email parameter using allowlist validation (e.g., regex for valid email format) and apply output encoding when rendering user-supplied data to prevent script execution.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-50866 — 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-2025-50866 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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