CVE-2018-15603
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 · uneditedAn issue was discovered in Victor CMS through 2018-05-10. There is XSS via the Author field of the "Leave a Comment" screen.
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 confidenceStored XSS vulnerability in Victor CMS where the Author field of the comment submission form does not properly sanitize or encode user input. When other users view the comments page, the malicious JavaScript payload injected into the Author field executes in their browsers, potentially allowing session hijacking, cookie theft, or phishing attacks.
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<= 2018-05-10CVSS 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:3.0/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 Victor CMS installation and versionLocate the Victor CMS installation in your web root directory. Check for version information in typically versioned files such as README, CHANGELOG, or version.php. Compare the installed version date to the affected range (2018-05-10 or earlier).Affected if The installed version date is 2018-05-10 or earlier, or no version information is found but the software appears to be the original Victor CMS build from that period.
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Verify comment submission functionality existsNavigate to the comment submission form on your Victor CMS site. This is typically found on article pages or a dedicated comments page. Confirm the form contains an Author (or similar name) input field.Affected if The comment submission form with an Author field is present and accessible on the site.
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Test Author field for output encoding on the comments display pageView the comments page where submitted comments are displayed. Inspect the HTML source of the page where author names appear. Check whether special characters like <, >, or quotes are HTML-encoded (e.g., appear as <, >, ") or rendered as raw HTML.Affected if The Author field value is displayed without HTML encoding, meaning raw HTML/JavaScript tags would render in the browser.
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Confirm comment functionality is publicly accessibleDetermine if the comment submission form is accessible to unauthenticated users or regular authenticated users (not just administrators). Check user role permissions or test form submission as a standard user.Affected if Regular users or anonymous visitors can submit comments with custom Author field values that get stored and displayed to others.
Your environment is likely affected if Victor CMS version is 2018-05-10 or earlier AND the comment submission form with an Author field is enabled and accessible on your site, with the Author value rendered without HTML encoding on the comments display page.
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 and output encoding for the Author field. Use a whitelist approach for allowed characters and apply HTML encoding when displaying the author name. Consider adding Content-Security-Policy headers as defense-in-depth.
- Consultation3.0 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-2018-15603 — 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-2018-15603 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
- No spam, self-promotion, credentials, or personal data