CVE-2024-39242
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 · uneditedA cross-site scripting (XSS) vulnerability in skycaiji v2.8 allows attackers to execute arbitrary web scripts or HTML via a crafted payload using eval(String.fromCharCode()).
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 XSS vulnerability exists in skycaiji v2.8 where user-supplied input is passed to JavaScript's eval() function, allowing attackers to bypass filters using String.fromCharCode() to construct and execute arbitrary JavaScript code or HTML payloads.
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= 2.8CVSS 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 Skycaiji versionLocate the version information for your Skycaiji installation. Check common locations such as: the admin dashboard About/Help page, a version.php or version.json file in the application root or /includes/ directory, or the footer of the web interface. Compare the installed version to the affected range (version 2.8).Affected if The installed version is exactly 2.8
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Locate eval() usage in source codeSearch the application source code for instances of eval() function calls. Review PHP files in controllers, models, and common utility directories. Look for eval() statements that accept variable input, particularly in files handling user submissions or data processing.Affected if The application code contains eval() that processes user-supplied input
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Verify user input reaches eval()Examine the code path from user input (GET/POST parameters, form submissions, or API requests) to the eval() call. Check if input validation or sanitization occurs before the eval() statement. Determine if String.fromCharCode() or similar encoding techniques could be used to inject malicious payloads.Affected if User-controlled input can reach eval() without adequate sanitization
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Check if vulnerable feature is accessibleDetermine whether the functionality containing the vulnerable eval() call is accessible to regular users or requires authentication. Review routes, controllers, and access control configurations to confirm the attack surface.Affected if The vulnerable code path is accessible to authenticated or anonymous users
You are affected if your Skycaiji installation is version 2.8 and contains eval() code that processes user input without proper sanitization, allowing the String.fromCharCode() bypass technique to execute arbitrary JavaScript.
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 strict input validation, sanitize user inputs before passing to eval(), apply output encoding when displaying user data, and replace eval() with safer alternatives.
- Consultation4.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-39242 — 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-2024-39242 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
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