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NimbusApplication · Tibco

CVE-2023-26218

CRITICAL · 9.0 CVSS v3.1 Published 2023-09-29
Fix available
A fix is available. Upgrade to 10.6.1 or later.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable

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 · unedited
The Web Client component of TIBCO Software Inc.'s TIBCO Nimbus contains easily exploitable Reflected Cross Site Scripting (XSS) vulnerabilities that allow a low privileged attacker to social engineer a legitimate user with network access to execute scripts targeting the affected system or the victim's local system. A successful attack using this vulnerability requires human interaction from a person other than the attacker. Affected releases are TIBCO Software Inc.'s TIBCO Nimbus: versions 10.6.0 and below.

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 confidence

Reflected Cross Site Scripting (XSS) vulnerability in TIBCO Nimbus Web Client allows low-privileged attackers to inject malicious scripts via crafted URLs that are reflected back in server responses, requiring social engineering of legitimate users to execute.

MitigationUpgrade TIBCO Nimbus to a version above 10.6.0; implement input validation, output encoding, and Content Security Policy headers as compensating controls until patch is applied.

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
NimbusApplication
Affected:< 10.6.1

CVSS 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
Low
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify TIBCO Nimbus installation
    Locate TIBCO Nimbus installation directory, typically under the TIBCO home folder, or check for nimbus-related processes running on the server
    Affected if TIBCO Nimbus is not found on the system, the vulnerability does not apply
  2. Determine installed Nimbus version
    Check the product version from the TIBCO Nimbus installation, usually accessible via the product's About page in the web client, administrative console, or version manifest file in the installation directory
    Affected if The installed version is lower than 10.6.1 (for example, 10.5.0, 10.4.x, or earlier)
  3. Verify Web Client is accessible
    Confirm the TIBCO Nimbus Web Client interface is accessible by accessing the application's URL in a browser or via network scan
    Affected if The Web Client is not exposed or accessible, the reflected XSS attack surface is not present
  4. Check URL reflection behavior
    Test by crafting a test URL with a benign script payload (such as ?test=<script>alert(1)</script>) and observe whether the payload is reflected unescaped in the server response
    Affected if The injected script content appears verbatim in the response without HTML encoding, indicating the vulnerability is present

You are affected if TIBCO Nimbus with a version below 10.6.1 is installed and its Web Client interface is accessible, allowing attacker-controlled URLs to reflect unsanitized input back to users.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Upgrade available Upgrade to 10.6.1 or later
Fixed in 10.6.1
Interim mitigation

Upgrade TIBCO Nimbus to a version above 10.6.0; implement input validation, output encoding, and Content Security Policy headers as compensating controls until patch is applied.

Recommended fix Moderate confidence

TIBCO Nimbus 10.6.1 or later

  1. Backup your current TIBCO Nimbus installation and all associated data
  2. Download TIBCO Nimbus version 10.6.1 or later from the official TIBCO support portal at tibco.com
  3. Review the TIBCO Nimbus 10.6.1 release notes and upgrade documentation for any prerequisites
  4. Stop all Nimbus services and components before applying the upgrade
  5. Install or apply the Nimbus 10.6.1 upgrade following the official upgrade procedures
  6. Restart all Nimbus services after the upgrade is complete
  7. Verify the upgrade was successful by checking the version number and testing the Web Client functionality
  8. Confirm the XSS vulnerability is resolved by reviewing TIBCO's security advisory for this CVE
Caveat Review TIBCO Nimbus 10.6.1 release notes for any compatibility or migration considerations before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Nimbus Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-26218 in production — separate from our analysis above.

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What this is

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.

What belongs here
  • 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