What is CVE-2021-28827?

CVE-2021-28827 is a critical-severity vulnerability in Tibco Administrator, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2021-04-20.

How severe is CVE-2021-28827?

Critical severity. CVSS v3 base score is 9.6 out of 10.

XSS in Tibco Administrator

CVE-2021-28827

The Administration GUI component of TIBCO Software Inc.'s TIBCO Administrator - Enterprise Edition, TIBCO Administrator - Enterprise Edition, TIBCO Administrator - Enterprise Edition Distribution for TIBCO Silver Fabric, TIBCO Administrator - Enterprise Edition Distribution for TIBCO Silver Fabric, TIBCO Administrator - Enterprise Edition for z/Linux, TIBCO Administrator - Enterprise Edition for z/Linux, TIBCO Runtime Agent, TIBCO Runtime Agent, TIBCO Runtime Agent for z/Linux, and TIBCO Runtime Agent for z/Linux contains an easily exploitable vulnerability that allows an unauthenticated attacker to social engineer a legitimate user with network access to execute a Stored XSS attack targeting the affected 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 Administrator - Enterprise Edition: versions 5.10.2 and below, TIBCO Administrator - Enterprise Edition: versions 5.11.0 and 5.11.1, TIBCO Administrator - Enterprise Edition Distribution for TIBCO Silver Fabric: versions 5.10.2 and below, TIBCO Administrator - Enterprise Edition Distribution for TIBCO Silver Fabric: versions 5.11.0 and 5.11.1, TIBCO Administrator - Enterprise Edition for z/Linux: versions 5.10.2 and below, TIBCO Administrator - Enterprise Edition for z/Linux: versions 5.11.0 and 5.11.1, TIBCO Runtime Agent: versions 5.10.2 and below, TIBCO Runtime Agent: versions 5.11.0 and 5.11.1, TIBCO Runtime Agent for z/Linux: versions 5.10.2 and below, and TIBCO Runtime Agent for z/Linux: versions 5.11.0 and 5.11.1.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-04-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.011 (64.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Tibco Administrator — versions 5.11.0, 5.11.1
Tibco Runtime Agent — versions 5.11.0, 5.11.1
Tibco Software Inc. Administrator - Enterprise Edition — versions unspecified, 5.11.0, 5.11.1
Tibco Software Inc. Administrator - Enterprise Edition Distribution For Silver Fabric — versions unspecified, 5.11.0, 5.11.1
Tibco Software Inc. Administrator - Enterprise Edition For Z/linux — versions unspecified, 5.11.0, 5.11.1
Tibco Software Inc. Runtime Agent — versions unspecified, 5.11.0, 5.11.1
Tibco Software Inc. Runtime Agent For Z/linux — versions unspecified, 5.11.0, 5.11.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.tibco.com/services/support/advisories (Vendor Advisory)
www.tibco.com/support/advisories/2021/04/tibco-security-advisory-april-20-2021-… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-28827?: CVE-2021-28827 is a critical-severity vulnerability in Tibco Administrator, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2021-04-20.
How severe is CVE-2021-28827?: Critical severity. CVSS v3 base score is 9.6 out of 10.