CVE-2018-20339
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 · uneditedZoho ManageEngine OpManager 12.3 before build 123239 allows XSS in the Notes column of the Alarms section.
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 confidenceZoho ManageEngine OpManager 12.3 before build 123239 contains a stored Cross-Site Scripting (XSS) vulnerability in the Notes field of the Alarms section. User-supplied input in the Notes column is not properly sanitized or encoded before being rendered, allowing an attacker to inject malicious JavaScript that executes in the context of other users' 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= 12.3CVSS 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 OpManager versionAccess the OpManager web interface and navigate to the About or Help section to view the product version and build number. Alternatively, check the installation directory for a version info file.Affected if The version shows 12.3 with a build number lower than 123239
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Confirm Alarms section accessLog into OpManager and navigate to the Alarms section in the web UI to verify the module is accessible for the user account being tested.Affected if The Alarms section is accessible and functional for the logged-in user
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Check Notes field presenceIn the Alarms section, locate any alarm details that contain a Notes field or column. Verify the field accepts user input.Affected if A Notes field exists in the Alarms section and accepts input without immediate sanitization feedback
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Verify stored XSS vulnerabilityAttempt to insert a benign test script such as <script>alert('test')</script> into the Notes field of an alarm. Save the entry and then view or refresh the alarm to see if the script executes.Affected if The JavaScript code executes when viewing the alarm notes, indicating the input is not properly encoded
If OpManager is version 12.3 with build below 123239 AND the Alarms section with Notes field is accessible, the environment is vulnerable to stored XSS via unsanitized alarm notes.
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 ManageEngine OpManager build 123239 or later, which includes proper input validation and output encoding for the Notes field. Until patched, restrict access to the Alarms section and avoid viewing untrusted alarm notes.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-20339 — 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-2018-20339 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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