CVE-2021-23271
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 · uneditedThe TIBCO EBX Web Server component of TIBCO Software Inc.'s TIBCO EBX contains a vulnerability that theoretically allows a low privileged attacker with network access to execute a Stored Cross Site Scripting (XSS) attack on the affected system. Affected releases are TIBCO Software Inc.'s TIBCO EBX: versions 5.9.12 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 · moderate confidenceTIBCO EBX Web Server contains a stored Cross Site Scripting (XSS) vulnerability that allows low-privileged attackers with network access to inject malicious scripts into the application. These scripts persist in the system and execute in the browsers of other users who access the affected pages.
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<= 5.9.12CVSS 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
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/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 checksWork through these to decide whether this CVE applies to you.
-
Identify TIBCO EBX installation versionLocate the EBX installation directory and check the version file or launcher configuration. Look for a version manifest, about file, or check the admin interface for the version number.Affected if The installed version is 5.9.12 or any earlier version (5.9.x before 5.9.13)
-
Confirm EBX Web Server is accessibleVerify that the EBX web interface is enabled and accessible on the network. Check the web server configuration for the HTTP/HTTPS port bindings.Affected if The web server component is exposed and accessible to network users
-
Determine if low-privileged user access is enabledReview the EBX user management configuration to confirm if low-privileged or standard users have access to create or modify content through the web interface.Affected if Low-privileged users can access and submit content through web forms
-
Check for custom or user-generated content featuresIdentify which web pages or modules allow users to submit persistent content such as comments, custom labels, descriptions, or metadata fields.Affected if The application contains features that store and display user-supplied data to other users
-
Audit web page outputs for input reflectionExamine the application's web pages that display stored user content, looking for areas where submitted data is rendered without proper output encoding.Affected if Stored user input is rendered in web pages without sanitization
You are affected if TIBCO EBX version 5.9.12 or earlier is installed AND the web server component is accessible to users who can submit persistent content that gets displayed to others.
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 TIBCO EBX to version 5.9.13 or later, which contains the vendor patch. As a temporary measure, implement strict input validation and output encoding on user-supplied data.
- Consultation4.0 h
- Implementation8.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,656.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-23271 — 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-2021-23271 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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