What is CVE-2020-4520?

CVE-2020-4520 is a high-severity vulnerability in IBM Cognos Analytics, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2021-06-01.

How severe is CVE-2020-4520?

High severity. CVSS v3 base score is 8.8 out of 10.

XSS in IBM Cognos Analytics

CVE-2020-4520

IBM Cognos Analytics 11.0 and 11.1 could allow a remote attacker to inject malicious HTML code that when viewed by the authenticated victim would execute the code. IBM X-Force ID: 182395.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-06-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.027 (85.9th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000

Affected products

IBM Cognos Analytics — versions 11.0, 11.1
IBM Cognos Analytics — versions 11.0.0, 11.1.0
NetApp Oncommand Insight

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.ibm.com/support/pages/node/6451705 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/182395 (VDB Entry, vdb-entry, Vendor Advisory)
security.netapp.com/advisory/ntap-20210622-0004/ (Third Party Advisory)

Frequently asked questions

What is CVE-2020-4520?: CVE-2020-4520 is a high-severity vulnerability in IBM Cognos Analytics, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2021-06-01.
How severe is CVE-2020-4520?: High severity. CVSS v3 base score is 8.8 out of 10.