What is CVE-2021-23271?

CVE-2021-23271 is a high-severity vulnerability in Tibco Ebx, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2021-02-02.

How severe is CVE-2021-23271?

High severity. CVSS v3 base score is 8.0 out of 10.

XSS in Tibco Ebx

CVE-2021-23271

The 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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-02-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Tibco Ebx
Tibco Software Inc. Ebx — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.tibco.com/services/support/advisories (Product)
www.tibco.com/support/advisories/2021/02/tibco-security-advisory-february-2-202… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-23271?: CVE-2021-23271 is a high-severity vulnerability in Tibco Ebx, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2021-02-02.
How severe is CVE-2021-23271?: High severity. CVSS v3 base score is 8.0 out of 10.