CVE-2021-23271Network attack vector

Administrative web access via stored cross-site scripting

Published Feb 2, 2021 · Updated Sep 16, 2024

Stored XSS in the TIBCO EBX Web Server 5.9.12 and earlier allows remote authenticated users to gain administrative web access. TIBCO has not published the affected input, rendering sink, or missing neutralization operation in the Web Server. Exploitation requires low-privileged network access and interaction by another user, and a privileged victim can expose full administrative control of the web interface.

CVSS severity8.0
High
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the TIBCO EBX Web Server 5.9.12 and earlier allows remote authenticated users to gain administrative web access. TIBCO has not published the affected input, rendering sink, or missing neutralization operation in the Web Server. Exploitation requires low-privileged network access and interaction by another user, and a privileged victim can expose full administrative control of the web interface.

The record

CVE
CVE-2021-23271
Published
Feb 2, 2021
Updated
Sep 16, 2024
Vendor
TIBCO Software Inc.
Product
TIBCO EBX
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=5.9.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TIBCO Software Inc. · TIBCO EBXversion=unspecified <=5.9.12

Published CVSS scores

6.0NIST NVDAV:N/AC:M/Au:S/C:P/I:P/A:P
8.0TIBCO Software Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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