CVE-2020-4849
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 · uneditedIBM Tivoli Netcool Impact 7.1.0.0 through 7.1.0.19 Interim Fix 7 could allow a remote attacker to bypass security restrictions, caused by a reverse tabnabbing flaw. An attacker could exploit this vulnerability and redirect a vitcim to a phishing site. IBM X-Force ID: 190294.
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 confidenceIBM Tivoli Netcool Impact versions 7.1.0.0 through 7.1.0.19 Interim Fix 7 contains a reverse tabnabbing vulnerability where links with target='_blank' can be exploited to redirect users to malicious phishing sites. The attacker can manipulate the original page after opening a new tab, bypassing same-origin restrictions and security controls.
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>= 7.1.0.0, <= 7.1.0.19CVSS 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 Netcool Impact versionLocate the installed version of IBM Tivoli Netcool Impact by checking the product documentation or using the version reporting mechanism built into the installation (typically via the impactcli command or the Integrated Solutions Console). Compare your version number against the affected range 7.1.0.0 through 7.1.0.19.Affected if The installed version falls within 7.1.0.0 to 7.1.0.19 inclusive.
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Confirm web interface is accessibleVerify that the Netcool Impact web interface (typically accessed via HTTP/HTTPS on port 16311 or through the Integrated Solutions Console) is deployed and accessible in your environment.Affected if The web interface is enabled and accessible to users.
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Inspect web pages for target=_blank linksUse a web browser developer tool or search the web application source files (JSP, HTML, JavaScript files in the installation directory) for instances of target="_blank" without the corresponding rel="noopener noreferrer" attribute.Affected if Any links with target="_blank" are found missing the rel="noopener noreferrer" attribute.
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Review JavaScript for window.open usageExamine JavaScript files in the web application for window.open() calls that do not includenoopener and noreferrer in their features or referrer policy settings.Affected if window.open() calls lack proper referrer policy controls.
You are affected if your installed Netcool Impact version is between 7.1.0.0 and 7.1.0.19 and your web interface contains links with target="_blank" that are missing rel="noopener noreferrer" attributes.
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 dataApply the appropriate interim fix from IBM (refer to IBM X-Force ID 190294) to address the reverse tabnabbing flaw. As a compensating control, ensure all links using target='_blank' include rel='noopener noreferrer' attributes.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-4849 — 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-2020-4849 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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